Add FindWine module and use it in main CMakeLists.txt

Old CheckLibraryExists implementation didn't work on my system.
A find module should be better and also easier to maintain.

CMakeLists.txt

@@ -282,27 +282,13 @@ ENDIF(LMMS_BUILD_LINUX OR LMMS_BUILD_APPLE)
 
 # check for WINE
 IF(WANT_VST)
-	INCLUDE(CheckLibraryExists)
-	INCLUDE(CheckIncludeFileCXX)
-	SET(CMAKE_REQUIRED_FLAGS_ORIG ${CMAKE_REQUIRED_FLAGS})
-	SET(CMAKE_REQUIRED_INCLUDES_ORIG ${CMAKE_REQUIRED_INCLUDES})
-	SET(CMAKE_CXX_COMPILER_ORIG ${CMAKE_CXX_COMPILER})
-	IF(LMMS_HOST_X86_64)
-		SET(CMAKE_REQUIRED_FLAGS -m32 ${CMAKE_REQUIRED_FLAGS})
-	ENDIF(LMMS_HOST_X86_64)
-	CHECK_LIBRARY_EXISTS(wine wine_init "" HAVE_LIBWINE)
-	SET(CMAKE_CXX_COMPILER /usr/bin/wineg++)
-	SET(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES} ${CMAKE_INSTALL_PREFIX}/include/wine/windows /usr/include/wine/windows)
-	CHECK_INCLUDE_FILE_CXX(windows.h HAVE_WINDOWS_H)
-	SET(CMAKE_CXX_COMPILER ${CMAKE_CXX_COMPILER_ORIG})
-	SET(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_ORIG})
-	SET(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES_ORIG})
-	IF(HAVE_LIBWINE AND HAVE_WINDOWS_H)
+	FIND_PACKAGE(Wine)
+	IF(WINE_FOUND)
 		SET(LMMS_SUPPORT_VST TRUE)
 		SET(STATUS_VST "OK")
-	ELSE(HAVE_LIBWINE AND HAVE_WINDOWS_H)
+	ELSE(WINE_FOUND)
 		SET(STATUS_VST "not found, please install (lib)wine-dev (or similiar) - 64 bit systems additionally need gcc-multilib and g++-multilib")
-	ENDIF(HAVE_LIBWINE AND HAVE_WINDOWS_H)
+	ENDIF(WINE_FOUND)
 ENDIF(WANT_VST)
 IF(LMMS_BUILD_WIN32)
 	SET(LMMS_SUPPORT_VST TRUE)

cmake/modules/FindWine.cmake

@@ -0,0 +1,19 @@
+# - Try to find the wine libraries
+# Once done this will define
+#
+#  WINE_FOUND - System has wine
+#  WINE_INCLUDE_DIRS - The wine include directories
+#  WINE_LIBRARIES - The libraries needed to use wine
+#  WINE_DEFINITIONS - Compiler switches required for using wine
+#
+
+FIND_PATH(WINE_INCLUDE_DIR windows/windows.h PATH_SUFFIXES wine)
+FIND_LIBRARY(WINE_LIBRARY NAMES wine)
+
+set(WINE_INCLUDE_DIRS ${WINE_INCLUDE_DIR} )
+set(WINE_LIBRARIES ${WINE_LIBRARY} )
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Wine DEFAULT_MSG WINE_LIBRARIES WINE_INCLUDE_DIRS)
+
+mark_as_advanced(WINE_INCLUDE_DIR WINE_LIBRARY)