CMake: Fix build with CMake 3.28 on macOS

FindWrapOpenGL.cmake assumed that IMPORTED_LOCATION is the absolute path
of the library within the framework. That's not the case with CMake 3.28
anymore. There, IMPORTED_LOCATION is the absolute path of the framework
directory.

The relevant upstream CMake change is
6b01a27f901b5eb392955fea322cde44a1b782a3.

Pick-to: 6.2 6.5 6.6
Change-Id: I6b702a28318e0978c56dec83c398965aa77ef020
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

cmake/FindWrapOpenGL.cmake

@@ -17,14 +17,18 @@ if (OpenGL_FOUND)
 
     add_library(WrapOpenGL::WrapOpenGL INTERFACE IMPORTED)
     if(APPLE)
+        # CMake 3.27 and older:
         # On Darwin platforms FindOpenGL sets IMPORTED_LOCATION to the absolute path of the library
         # within the framework. This ends up as an absolute path link flag, which we don't want,
         # because that makes our .prl files un-relocatable.
         # Extract the framework path instead, and use that in INTERFACE_LINK_LIBRARIES,
-        # which CMake ends up transforming into a reloctable -framework flag.
+        # which CMake ends up transforming into a relocatable -framework flag.
         # See https://gitlab.kitware.com/cmake/cmake/-/issues/20871 for details.
+        #
+        # CMake 3.28 and above:
+        # IMPORTED_LOCATION is the absolute path the the OpenGL.framework folder.
         get_target_property(__opengl_fw_lib_path OpenGL::GL IMPORTED_LOCATION)
-        if(__opengl_fw_lib_path)
+        if(__opengl_fw_lib_path AND NOT __opengl_fw_lib_path MATCHES "/([^/]+)\\.framework$")
             get_filename_component(__opengl_fw_path "${__opengl_fw_lib_path}" DIRECTORY)
         endif()