FindPython: fix erroneous ${CMAKE_SHARED_LIBRARY_SUFFIX} matching

Fixes: #24556

Modules/FindPython/Support.cmake

@@ -492,7 +492,7 @@ function (_PYTHON_GET_CONFIG_VAR _PYTHON_PGCV_VALUE NAME)
         list (REMOVE_DUPLICATES _values)
       elseif (NAME STREQUAL "SOABI")
         # clean-up: remove prefix character and suffix
-        if (_values MATCHES "^(\\.${CMAKE_SHARED_LIBRARY_SUFFIX}|\\.so|\\.pyd)$")
+        if (_values MATCHES "^(${CMAKE_SHARED_LIBRARY_SUFFIX}|\\.so|\\.pyd)$")
           set(_values "")
         else()
           string (REGEX REPLACE "^[.-](.+)(${CMAKE_SHARED_LIBRARY_SUFFIX}|\\.(so|pyd))$" "\\1" _values "${_values}")
@@ -543,7 +543,7 @@ function (_PYTHON_GET_CONFIG_VAR _PYTHON_PGCV_VALUE NAME)
       else()
         if (_values)
           # clean-up: remove prefix character and suffix
-          if (_values MATCHES "^(\\.${CMAKE_SHARED_LIBRARY_SUFFIX}|\\.so|\\.pyd)$")
+          if (_values MATCHES "^(${CMAKE_SHARED_LIBRARY_SUFFIX}|\\.so|\\.pyd)$")
             set(_values "")
           else()
             string (REGEX REPLACE "^[.-](.+)(${CMAKE_SHARED_LIBRARY_SUFFIX}|\\.(so|pyd))$" "\\1" _values "${_values}")
@@ -570,7 +570,7 @@ function (_PYTHON_GET_CONFIG_VAR _PYTHON_PGCV_VALUE NAME)
           endforeach()
           if (_values)
             # clean-up: remove prefix character and suffix
-            if (_values MATCHES "^(\\.${CMAKE_SHARED_LIBRARY_SUFFIX}|\\.so|\\.pyd)$")
+            if (_values MATCHES "^(${CMAKE_SHARED_LIBRARY_SUFFIX}|\\.so|\\.pyd)$")
               set(_values "")
             else()
               string (REGEX REPLACE "^[.-](.+)(${CMAKE_SHARED_LIBRARY_SUFFIX}|\\.(so|pyd))$" "\\1" _values "${_values}")