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

lib/CMakeLists.txt

@@ -29,7 +29,7 @@ set_property(DIRECTORY APPEND PROPERTY COMPILE_DEFINITIONS "${CURL_DEBUG_MACROS}
 
 configure_file("curl_config.h.cmake" "${CMAKE_CURRENT_BINARY_DIR}/curl_config.h")
 
-# Get 'CSOURCES', 'HHEADERS' variables
+# Get CSOURCES, HHEADERS variables
 curl_transform_makefile_inc("Makefile.inc" "${CMAKE_CURRENT_BINARY_DIR}/Makefile.inc.cmake")
 include("${CMAKE_CURRENT_BINARY_DIR}/Makefile.inc.cmake")
 
@@ -231,7 +231,7 @@ if(BUILD_SHARED_LIBS)
   option(CURL_LIBCURL_VERSIONED_SYMBOLS "Enable libcurl versioned symbols" OFF)
 
   if(CURL_LIBCURL_SOVERSION OR CURL_LIBCURL_VERSIONED_SYMBOLS)
-    # Get 'VERSIONCHANGE', 'VERSIONADD', 'VERSIONDEL', 'VERSIONINFO' variables
+    # Get VERSIONCHANGE, VERSIONADD, VERSIONDEL, VERSIONINFO variables
     curl_transform_makefile_inc("Makefile.soname" "${CMAKE_CURRENT_BINARY_DIR}/Makefile.soname.cmake")
     include("${CMAKE_CURRENT_BINARY_DIR}/Makefile.soname.cmake")
 

lib/Makefile.am

@@ -57,8 +57,6 @@ AM_CPPFLAGS = -I$(top_srcdir)/include   \
 # Prevent LIBS from being used for all link targets
 LIBS = $(BLANK_AT_MAKETIME)
 
-include Makefile.soname
-
 AM_CPPFLAGS += -DBUILDING_LIBCURL
 AM_LDFLAGS =
 AM_CFLAGS =
@@ -69,7 +67,7 @@ if CURLDEBUG
 AM_CPPFLAGS += -DCURLDEBUG
 endif
 
-# Makefile.inc provides the CSOURCES and HHEADERS defines
+# Get CSOURCES, HHEADERS variables
 include Makefile.inc
 
 if DOING_NATIVE_WINDOWS
@@ -86,7 +84,7 @@ if CURLDEBUG
 curl_EXCLUDE += memdebug.c
 endif
 libcurl_unity.c: $(top_srcdir)/scripts/mk-unity.pl $(CSOURCES)
-	@PERL@ $(top_srcdir)/scripts/mk-unity.pl $(srcdir) $(CSOURCES) --exclude $(curl_EXCLUDE) > libcurl_unity.c
+	@PERL@ $(top_srcdir)/scripts/mk-unity.pl --srcdir $(srcdir) --include $(CSOURCES) --exclude $(curl_EXCLUDE) > libcurl_unity.c
 
 nodist_libcurl_la_SOURCES = libcurl_unity.c
 libcurl_la_SOURCES = $(curl_EXCLUDE)
@@ -103,6 +101,8 @@ libcurl_la_LDFLAGS_EXTRA =
 libcurl_la_CFLAGS_EXTRA =
 
 if CURL_LT_SHLIB_USE_VERSION_INFO
+# Get VERSIONCHANGE, VERSIONADD, VERSIONDEL, VERSIONINFO variables
+include Makefile.soname
 libcurl_la_LDFLAGS_EXTRA += $(VERSIONINFO)
 endif
 

lib/Makefile.inc

@@ -21,6 +21,7 @@
 # SPDX-License-Identifier: curl
 #
 ###########################################################################
+# Shared between CMakeLists.txt and Makefile.am
 
 LIB_CURLX_CFILES = \
   curlx/base64.c   \

lib/Makefile.soname

@@ -21,6 +21,7 @@
 # SPDX-License-Identifier: curl
 #
 ###########################################################################
+# Shared between CMakeLists.txt and Makefile.am
 
 # Keep in sync with CURL_LIBCURL_VERSIONED_SYMBOLS_SONAME in configure.ac
 VERSIONCHANGE=12