Check if winegcc works before building RemoteVstPlugin

cmake/modules/CheckWineGcc.cmake

@@ -0,0 +1,27 @@
+INCLUDE(CheckCXXSourceCompiles)
+
+FUNCTION(CheckWineGcc BITNESS WINEGCC_EXECUTABLE RESULT)
+	FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/winegcc_test.cxx" "
+	#include <iostream>
+	#define USE_WS_PREFIX
+	#include <windows.h>
+	int main(int argc, const char* argv[]) {
+		return 0;
+	}
+	")
+	EXECUTE_PROCESS(COMMAND ${WINEGCC_EXECUTABLE} "-m${BITNESS}"
+		"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/winegcc_test.cxx"
+		"-o" "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/winegcc_test"
+		OUTPUT_QUIET ERROR_QUIET
+		RESULT_VARIABLE WINEGCC_RESULT
+	)
+	FILE(REMOVE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/winegcc_test.cxx"
+		"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/winegcc_test"
+		"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/winegcc_test.exe.so"
+	)
+	IF(WINEGCC_RESULT EQUAL 0)
+		SET(${RESULT} True PARENT_SCOPE)
+	ELSE()
+		SET(${RESULT} False PARENT_SCOPE)
+	ENDIF()
+ENDFUNCTION()