CMake: Set GCC version specific subfolder for MinGW (#4671)

Author: beutlich

Modelica/Resources/BuildProjects/CMake/Modelica_platform.cmake

@@ -78,6 +78,9 @@ function(get_modelica_platform_name_with_compiler_version var)
       set(PLATFORM_PATH_SUFFIX "${PLATFORM_PATH_SUFFIX}/vs2022")
     elseif(MSVC_VERSION GREATER_EQUAL 1950 AND MSVC_VERSION LESS 1960)
       set(PLATFORM_PATH_SUFFIX "${PLATFORM_PATH_SUFFIX}/vs2026")
+    elseif(CMAKE_C_COMPILER_ID STREQUAL "GNU")
+      string(REPLACE "." "" GCC_VERSION_NO_DOTS "${CMAKE_C_COMPILER_VERSION}")
+      set(PLATFORM_PATH_SUFFIX "${PLATFORM_PATH_SUFFIX}/gcc${GCC_VERSION_NO_DOTS}")
     endif()
   endif()