pytest: enable in 5 GHA jobs, fix fallouts

They take about 4.5 minutes of CI time in GHA/macos.

Also:
- autotools: improve `caddy`, `vsftpd` detection.
  Bringing it closer to cmake.
- autotools: fix `--with-test-caddy=no`, `--with-test-vsftps=no`,
  `--with-test-nghttpx=no` options.
- cmake: sync `nghttpx` default with autotools.
- pytest: disable failing mbedTLS tests on macOS CI.
- pytest: disable failing earlydata tests on macOS CI.
- GHA/macos: keep vsftpd pytests disabled due to lengthy run times.
- pytest: fix test_05_04 for LibreSSL. Ref: #17367
  Authored-by: Stefan Eissing

Remaining issues:
- some unidentified tests taking a long time with mbedTLS:
  `================= 462 passed, 278 skipped in 347.93s (0:05:47) =================`
  Ref: https://github.com/curl/curl/actions/runs/15073354301/job/42374999041#step:17:1536
  Workaround: not enabling pytest for mbedTLS jobs
- 17 FTP tests taking a long time (affecting all TLS backends):
  without vsftpd:
  `====================== 496 passed, 244 skipped in 56.15s =======================`
  Ref: https://github.com/curl/curl/actions/runs/15073354301/job/42374998230#step:17:1536
  with vsftpd:
  `================= 513 passed, 227 skipped in 409.37s (0:06:49) =================`
  Ref: https://github.com/curl/curl/actions/runs/15073678568/job/42376039672?pr=17362#step:17:1537
  Workaround: force-disable vsftpd.
- 100 tests failing with SecureTransport. Let's ignore that due to imminent deprecation.
  Ref: https://github.com/curl/curl/actions/runs/15055652333/job/42320873732#step:17:15362

Follow-up to 30ef79ed93 #17295
Follow-up to 9147903366 #16518

Closes #17362

.github/workflows/macos.yml

@@ -116,9 +116,11 @@ jobs:
           - name: 'LibreSSL +examples'
             compiler: clang
             install: libressl
+            install_steps: pytest
             configure: --enable-debug --with-openssl=$(brew --prefix libressl)
           - name: 'OpenSSL'
             compiler: clang
+            install_steps: pytest
             configure: --enable-debug --with-openssl=$(brew --prefix openssl)
           - name: 'OpenSSL event-based'
             compiler: clang
@@ -149,6 +151,7 @@ jobs:
             generate: -DOPENSSL_ROOT_DIR=$(brew --prefix libressl) -DENABLE_ARES=ON -DCURL_USE_GSSAPI=ON -DGSS_ROOT_DIR=$(brew --prefix heimdal) -DCURL_DISABLE_LDAP=ON
           - name: 'wolfSSL !ldap brotli zstd'
             install: brotli wolfssl zstd
+            install_steps: pytest
             generate: -DCURL_USE_WOLFSSL=ON -DCURL_DISABLE_LDAP=ON -DUSE_ECH=ON
           - name: 'mbedTLS openldap brotli zstd'
             install: brotli mbedtls zstd openldap
@@ -237,7 +240,7 @@ jobs:
             for _chkprefill in '' ${{ matrix.build.chkprefill }}; do
               options=''
               [ -n '${{ matrix.build.macos-version-min }}' ] && options+=' -DCMAKE_OSX_DEPLOYMENT_TARGET=${{ matrix.build.macos-version-min }}'
-              [[ '${{ matrix.build.install_steps }}' = *'pytest'* ]] && options+=' -DTEST_NGHTTPX= -DHTTPD_NGHTTPX='
+              [[ '${{ matrix.build.install_steps }}' = *'pytest'* ]] && options+=' -DVSFTPD=NO'  # Skip ~20 tests that stretch run time by 7x on macOS
               [ "${_chkprefill}" = '_chkprefill' ] && options+=' -D_CURL_PREFILL=OFF'
               cmake -B "bld${_chkprefill}" -G Ninja -D_CURL_PREFILL=ON \
                 -DCMAKE_INSTALL_PREFIX="$HOME/curl" \
@@ -260,7 +263,7 @@ jobs:
               CFLAGS+=" --sysroot=${sysroot}"
             fi
             [ -n '${{ matrix.build.macos-version-min }}' ] && CFLAGS+=' -mmacosx-version-min=${{ matrix.build.macos-version-min }}'
-            [[ '${{ matrix.build.install_steps }}' = *'pytest'* ]] && options+=' --with-test-nghttpx= ac_cv_path_HTTPD_NGHTTPX='
+            [[ '${{ matrix.build.install_steps }}' = *'pytest'* ]] && options+=' --with-test-vsftpd=no'  # Skip ~20 tests that stretch run time by 7x on macOS
             mkdir bld && cd bld && ../configure --enable-unity --enable-test-bundles --enable-warnings --enable-werror \
               --disable-dependency-tracking \
               --with-libpsl=$(brew --prefix libpsl) \