Automatically set C4COPYRIGHT_YEAR on win32

Version.txt

@@ -8,13 +8,13 @@ SET(C4PROJECT_DOMAIN    "openclonk")
 SET(C4PROJECT_TLD       "org")
 SET(C4PROJECT_URL       "http://www.{C4PROJECT_DOMAIN}.{C4PROJECT_TLD}")
 
-IF(UNIX)
+IF(CMAKE_HOST_UNIX)
 	EXECUTE_PROCESS(COMMAND "date" "+%Y" OUTPUT_VARIABLE DATE)
-	STRING(REGEX REPLACE "(.+)\n" "\\1" YEARFIXED "${DATE}")
-	SET(C4COPYRIGHT_YEAR ${YEARFIXED})
-ELSEIF(WIN32)
-	SET(C4COPYRIGHT_YEAR "2011")
+ELSEIF(CMAKE_HOST_WIN32)
+	EXECUTE_PROCESS(COMMAND "cscript.exe" "//nologo" "${CMAKE_CURRENT_SOURCE_DIR}/tools/get_current_year.vbs" OUTPUT_VARIABLE DATE)
 ENDIF()
+STRING(REGEX REPLACE "(.+)\n" "\\1" YEARFIXED "${DATE}")
+SET(C4COPYRIGHT_YEAR ${YEARFIXED})
 
 SET(C4ENGINENAME        "OpenClonk")
 SET(C4ENGINENICK        "openclonk")

tools/get_current_year.vbs

@@ -0,0 +1 @@
+Wscript.Echo DatePart("yyyy", Date())