cmake: Add CMake configuration files, meant for the prebuilt MinGW SDK

mingw/pkg-support/cmake/sdl2-config-version.cmake

@@ -0,0 +1,19 @@
+# SDL2 CMake version configuration file:
+# This file is meant to be placed in a cmake subfolder of SDL2-devel-2.x.y-mingw
+
+if(CMAKE_SIZEOF_VOID_P EQUAL 4)
+    set(sdl2_config_path "${CMAKE_CURRENT_LIST_DIR}/../i686-w64-mingw32/lib/cmake/SDL2/sdl2-config-version.cmake")
+elseif(CMAKE_SIZEOF_VOID_P EQUAL 8)
+    set(sdl2_config_path "${CMAKE_CURRENT_LIST_DIR}/../x86_64-w64-mingw32/lib/cmake/SDL2/sdl2-config-version.cmake")
+else("${CMAKE_SIZEOF_VOID_P}" STREQUAL "")
+    set(PACKAGE_VERSION_UNSUITABLE TRUE)
+    return()
+endif()
+
+if(NOT EXISTS "${sdl2_config_path}")
+    message(WARNING "${sdl2_config_path} does not exist: MinGW development package is corrupted")
+    set(PACKAGE_VERSION_UNSUITABLE TRUE)
+    return()
+endif()
+
+include("${sdl2_config_path}")

mingw/pkg-support/cmake/sdl2-config.cmake

@@ -0,0 +1,19 @@
+# SDL2 CMake configuration file:
+# This file is meant to be placed in a cmake subfolder of SDL2-devel-2.x.y-mingw
+
+if(CMAKE_SIZEOF_VOID_P EQUAL 4)
+    set(sdl2_config_path "${CMAKE_CURRENT_LIST_DIR}/../i686-w64-mingw32/lib/cmake/SDL2/sdl2-config.cmake")
+elseif(CMAKE_SIZEOF_VOID_P EQUAL 8)
+    set(sdl2_config_path "${CMAKE_CURRENT_LIST_DIR}/../x86_64-w64-mingw32/lib/cmake/SDL2/sdl2-config.cmake")
+else("${CMAKE_SIZEOF_VOID_P}" STREQUAL "")
+    set(PACKAGE_VERSION_UNSUITABLE TRUE)
+    return()
+endif()
+
+if(NOT EXISTS "${sdl2_config_path}")
+    message(WARNING "${sdl2_config_path} does not exist: MinGW development package is corrupted")
+    set(PACKAGE_VERSION_UNSUITABLE TRUE)
+    return()
+endif()
+
+include("${sdl2_config_path}")