cmake: match filename suffixes with file content

To:
- simplify recognizing CMake sources.
- ensure syntax highlighters use the correct file type.
- sync .h template filename with its autotools counterpart.

Also:
- cmakelint.sh: simplify, alpha sort the filelist.
- perlcheck.sh: simplify.

Closes #20039

.github/labeler.yml

@@ -65,7 +65,7 @@ build:
               **/*.mk,\
               *.m4,\
               docs/INSTALL-CMAKE.md,\
-              lib/curl_config.h.cmake,\
+              lib/curl_config-cmake.h.in,\
               lib/libcurl*.in,\
               CMake/**,\
               CMakeLists.txt,\
@@ -98,7 +98,7 @@ cmake:
               **/CMakeLists.txt,\
               CMake/**,\
               docs/INSTALL-CMAKE.md,\
-              lib/curl_config.h.cmake,\
+              lib/curl_config-cmake.h.in,\
               tests/cmake/**\
               }"
 

.github/workflows/configure-vs-cmake.yml

@@ -12,7 +12,7 @@ name: 'configure-vs-cmake'
       - '**/*.m4'
       - '**/CMakeLists.txt'
       - 'CMake/**'
-      - 'lib/curl_config.h.cmake'
+      - 'lib/curl_config-cmake.h.in'
       - 'tests/cmake/**'
       - '.github/scripts/cmp-config.pl'
       - '.github/workflows/configure-vs-cmake.yml'
@@ -25,7 +25,7 @@ name: 'configure-vs-cmake'
       - '**/*.m4'
       - '**/CMakeLists.txt'
       - 'CMake/**'
-      - 'lib/curl_config.h.cmake'
+      - 'lib/curl_config-cmake.h.in'
       - 'tests/cmake/**'
       - '.github/scripts/cmp-config.pl'
       - '.github/workflows/configure-vs-cmake.yml'