CI: misc improvements, restore VS2008 job

- appveyor: restore VS2008 job, after fixing its issues.
  Enable OpenSSL in it. It takes 1 minute.
  Follow-up to 9b0467b169 #16453
  Follow-up to edfa537100 #16456
- appveyor: make a copy of OpenSSL DLLs to have them picked up as an
  artifact (disabled by default) to aid local tests.
- appveyor: dump CMake configuration logs on failure.
- appveyor: tidy up job parameter defaults.
- GHA/windows: add pre-fill check option for dl-mingw jobs.
- GHA/windows: fix pre-fill check option for MSYS jobs by installing
  `diffutils`.
  Follow-up to e7adf3e837 #15841
- GHA/windows: de-duplicate to `PATH` commands for Cygwin.
- GHA/windows: drop `$SYSTEMROOT/System32` from `PATH` for Cygwin
  configure. It's not needed.
  Follow-up to 36fd2dd6ee #13599
- list `.pdb` files in curl version step for MSVC.
  Ref: #16439

Cherry-picked from #16394
Closes #16458

appveyor.sh

@@ -65,20 +65,24 @@ if [ "${BUILD_SYSTEM}" = 'CMake' ]; then
       -DCURL_USE_SCHANNEL="${SCHANNEL}" \
       -DCURL_USE_OPENSSL="${OPENSSL}" \
       -DCURL_USE_LIBPSL=OFF \
-      ${options}
+      ${options} \
+      || { cat _bld/CMakeFiles/CMake* 2>/dev/null; false; }
   done
   if [ -d _bld_chkprefill ] && ! diff -u _bld/lib/curl_config.h _bld_chkprefill/lib/curl_config.h; then
-    cat _bld_chkprefill/CMakeFiles/CMakeConfigureLog.yaml 2>/dev/null || true
+    cat _bld_chkprefill/CMakeFiles/CMake* 2>/dev/null || true
     false
   fi
-  if false; then
-    cat _bld/CMakeFiles/CMakeConfigureLog.yaml 2>/dev/null || true
-  fi
   echo 'curl_config.h'; grep -F '#define' _bld/lib/curl_config.h | sort || true
   # shellcheck disable=SC2086
-  cmake --build _bld --config "${PRJ_CFG}" --parallel 2 -- ${BUILD_OPT:-}
+  if ! cmake --build _bld --config "${PRJ_CFG}" --parallel 2 -- ${BUILD_OPT:-}; then
+    if [ "${PRJ_GEN}" = 'Visual Studio 9 2008' ]; then
+      find . -name BuildLog.htm -exec dos2unix '{}' +
+      find . -name BuildLog.htm -exec cat '{}' +
+    fi
+    false
+  fi
   [ "${SHARED}" = 'ON' ] && PATH="$PWD/_bld/lib/${PRJ_CFG}:$PATH"
-  [ "${OPENSSL}" = 'ON' ] && PATH="${openssl_root}:$PATH"
+  [ "${OPENSSL}" = 'ON' ] && { PATH="${openssl_root}:$PATH"; cp "${openssl_root}"/*.dll "_bld/src/${PRJ_CFG}"; }
   curl="_bld/src/${PRJ_CFG}/curl.exe"
 elif [ "${BUILD_SYSTEM}" = 'VisualStudioSolution' ]; then
   (
@@ -112,7 +116,7 @@ EOF
   curl="builds/libcurl-vc14.10-x64-${PATHPART}-dll-ssl-dll-ipv6-sspi/bin/curl.exe"
 fi
 
-find . \( -name '*.exe' -o -name '*.dll' -o -name '*.lib' \) -exec file '{}' \;
+find . \( -name '*.exe' -o -name '*.dll' -o -name '*.lib' -o -name '*.pdb' \) -exec file '{}' \;
 if [ -z "${SKIP_RUN:-}" ]; then
   "${curl}" --disable --version
 else