FindPython: enhance robustness of version extraction from library name

Fixes: #21105

Modules/FindPython/Support.cmake

@@ -558,18 +558,19 @@ function (_PYTHON_GET_VERSION)
   if (_PGV_LIBRARY)
     # retrieve version and abi from library name
     if (_${_PYTHON_PREFIX}_LIBRARY_RELEASE)
+      get_filename_component (library_name "${_${_PYTHON_PREFIX}_LIBRARY_RELEASE}" NAME)
       # extract version from library name
-      if (_${_PYTHON_PREFIX}_LIBRARY_RELEASE MATCHES "python([23])([0-9]+)")
+      if (library_name MATCHES "python([23])([0-9]+)")
         set (${_PGV_PREFIX}VERSION_MAJOR "${CMAKE_MATCH_1}" PARENT_SCOPE)
         set (${_PGV_PREFIX}VERSION_MINOR "${CMAKE_MATCH_2}" PARENT_SCOPE)
         set (${_PGV_PREFIX}VERSION "${CMAKE_MATCH_1}.${CMAKE_MATCH_2}" PARENT_SCOPE)
         set (${_PGV_PREFIX}ABI "" PARENT_SCOPE)
-      elseif (_${_PYTHON_PREFIX}_LIBRARY_RELEASE MATCHES "python([23])\\.([0-9]+)([dmu]*)")
+      elseif (library_name MATCHES "python([23])\\.([0-9]+)([dmu]*)")
         set (${_PGV_PREFIX}VERSION_MAJOR "${CMAKE_MATCH_1}" PARENT_SCOPE)
         set (${_PGV_PREFIX}VERSION_MINOR "${CMAKE_MATCH_2}" PARENT_SCOPE)
         set (${_PGV_PREFIX}VERSION "${CMAKE_MATCH_1}.${CMAKE_MATCH_2}" PARENT_SCOPE)
         set (${_PGV_PREFIX}ABI "${CMAKE_MATCH_3}" PARENT_SCOPE)
-      elseif (_${_PYTHON_PREFIX}_LIBRARY_RELEASE MATCHES "pypy(3)?")
+      elseif (library_name MATCHES "pypy(3)?-c")
         set (version "${CMAKE_MATCH_1}")
         if (version EQUAL "3")
           set (${_PGV_PREFIX}VERSION_MAJOR "3" PARENT_SCOPE)