tests: always make bundles, adapt build and tests

Make test bundles the default. Drop non-bundle build mode.
Also do all the optimizations and tidy-ups this allows, simpler builds,
less bundle exceptions, streamlined build mechanics.

Also rework the init/deinit macro magic for unit tests. The new method
allows using unique init/deinit function names, and calling them with
arguments. This is in turn makes it possible to reduce the use of global
variables.

Note this drop existing build options `-DCURL_TEST_BUNDLES=` from cmake
and `--enable-test-bundles` / `--disable-test-bundles` from autotools.

Also:
- rename test entry functions to have unique names: `test_<testname>`
  This removes the last exception that was handled in the generator.
- fix `make dist` to not miss test sources with test bundles enabled.
- sync and merge `tests/mk-bundle.pl` into `scripts/mk-unity.pl`.
- mk-unity.pl: add `--embed` option and use it when `CURL_CLANG_TIDY=ON`
  to ensure that `clang-tidy` does not miss external test C sources.
  (because `clang-tidy` ignores code that's #included.)
- tests/unit: drop no-op setup/stop functions.
- tests: reduce symbol scopes, global macros, other fixes and tidy-ups.
- tool1621: fix to run, also fix it to pass.
- sockfilt: fix Windows compiler warning in certain unity include order,
  by explicitly including `warnless.h`.

Follow-up to 6897aeb105 #17468

Closes #17590

.github/workflows/windows.yml

@@ -96,11 +96,11 @@ jobs:
           if [ "${MATRIX_BUILD}" = 'cmake' ]; then
             cmake -B bld -G Ninja -D_CURL_PREFILL=ON ${options} \
               -DCMAKE_INSTALL_PREFIX="$HOME"/curl-install \
-              -DCMAKE_UNITY_BUILD=ON -DCMAKE_UNITY_BUILD_BATCH_SIZE=30 -DCURL_TEST_BUNDLES=ON \
+              -DCMAKE_UNITY_BUILD=ON -DCMAKE_UNITY_BUILD_BATCH_SIZE=30 \
               -DCURL_WERROR=ON \
               ${MATRIX_CONFIG}
           else
-            mkdir bld && cd bld && ../configure --enable-unity --enable-test-bundles --enable-warnings --enable-werror \
+            mkdir bld && cd bld && ../configure --enable-unity --enable-warnings --enable-werror \
               --prefix="$HOME"/curl-install \
               --with-libssh2 \
               --disable-dependency-tracking \
@@ -290,7 +290,7 @@ jobs:
                 -DCMAKE_INSTALL_PREFIX="${HOME}"/curl-install \
                 -DCMAKE_C_FLAGS="${CFLAGS_CMAKE} ${CPPFLAGS}" \
                 -DCMAKE_BUILD_TYPE="${MATRIX_TYPE}" \
-                -DCMAKE_UNITY_BUILD=ON -DCMAKE_UNITY_BUILD_BATCH_SIZE=30 -DCURL_TEST_BUNDLES=ON \
+                -DCMAKE_UNITY_BUILD=ON -DCMAKE_UNITY_BUILD_BATCH_SIZE=30 \
                 -DCURL_WERROR=ON \
                 ${MATRIX_CONFIG}
             done
@@ -300,7 +300,7 @@ jobs:
             fi
           else
             export CFLAGS CPPFLAGS
-            mkdir bld && cd bld && ../configure --enable-unity --enable-test-bundles --enable-warnings --enable-werror \
+            mkdir bld && cd bld && ../configure --enable-unity --enable-warnings --enable-werror \
               --prefix="$HOME"/curl-install \
               --with-libssh2 \
               --disable-dependency-tracking \
@@ -512,7 +512,7 @@ jobs:
             cmake -B "bld${_chkprefill}" -G Ninja ${options} \
               -DCMAKE_C_COMPILER=gcc \
               -DCMAKE_BUILD_TYPE="${MATRIX_TYPE}" \
-              -DCMAKE_UNITY_BUILD=ON -DCMAKE_UNITY_BUILD_BATCH_SIZE=30 -DCURL_TEST_BUNDLES=ON \
+              -DCMAKE_UNITY_BUILD=ON -DCMAKE_UNITY_BUILD_BATCH_SIZE=30 \
               -DCURL_WERROR=ON \
               -DUSE_LIBIDN2=OFF \
               ${MATRIX_CONFIG}
@@ -636,13 +636,13 @@ jobs:
             cmake -B bld -G Ninja \
               -DCMAKE_SYSTEM_NAME=Windows \
               -DCMAKE_C_COMPILER_TARGET="${TRIPLET}" \
-              -DCMAKE_UNITY_BUILD=ON -DCURL_TEST_BUNDLES=ON \
+              -DCMAKE_UNITY_BUILD=ON \
               -DCURL_WERROR=ON \
               -DCURL_USE_SCHANNEL=ON -DUSE_WIN32_IDN=ON \
               -DCURL_USE_LIBPSL=OFF \
               ${options}
           else
-            mkdir bld && cd bld && ../configure --enable-unity --enable-test-bundles --enable-warnings --enable-werror \
+            mkdir bld && cd bld && ../configure --enable-unity --enable-warnings --enable-werror \
               --host="${TRIPLET}" \
               --with-schannel --with-winidn \
               --without-libpsl \
@@ -741,14 +741,14 @@ jobs:
               -DCMAKE_RC_COMPILER=arm-mingw32ce-windres \
               -DMINGW32CE_LIBRARY_DIR="$HOME/opt/mingw32ce/arm-mingw32ce/lib" \
               -DCMAKE_IGNORE_PREFIX_PATH=/opt/homebrew \
-              -DCMAKE_UNITY_BUILD=ON -DCMAKE_UNITY_BUILD_BATCH_SIZE=50 -DCURL_TEST_BUNDLES=ON \
+              -DCMAKE_UNITY_BUILD=ON -DCMAKE_UNITY_BUILD_BATCH_SIZE=50 \
               -DBUILD_SHARED_LIBS=ON -DBUILD_STATIC_LIBS=ON -DBUILD_STATIC_CURL=OFF \
               -DCURL_WERROR=ON \
               -DCURL_USE_SCHANNEL=ON \
               -DCURL_USE_LIBPSL=OFF
           else
             autoreconf -fi
-            mkdir bld && cd bld && ../configure --disable-dependency-tracking --enable-unity --enable-test-bundles --enable-warnings --enable-werror \
+            mkdir bld && cd bld && ../configure --disable-dependency-tracking --enable-unity --enable-warnings --enable-werror \
               --host=arm-mingw32ce \
               --with-schannel \
               --without-libpsl \
@@ -936,7 +936,7 @@ jobs:
               -DCMAKE_EXE_LINKER_FLAGS="-INCREMENTAL:NO ${ldflags}" \
               -DCMAKE_SHARED_LINKER_FLAGS="-INCREMENTAL:NO ${ldflags}" \
               -DCMAKE_VS_GLOBALS="TrackFileAccess=false${vsglobals}" \
-              -DCMAKE_UNITY_BUILD=ON -DCURL_TEST_BUNDLES=ON \
+              -DCMAKE_UNITY_BUILD=ON \
               -DCURL_WERROR=ON \
               -DLIBPSL_INCLUDE_DIR="${MINGW_PREFIX}/include" \
               -DLIBPSL_LIBRARY="${MINGW_PREFIX}/lib/libpsl.dll.a" \