Changed MSVC6 compile error to (_MSC_VER < 1300), reported by lab_zj

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2288 dfc29bdd-3216-0410-991c-e03cc46cb475

include/IrrCompileConfig.h

@@ -45,7 +45,7 @@
 #endif
 #endif
 
-#if defined(_MSC_VER) && (_MSC_VER < 1400) 
+#if defined(_MSC_VER) && (_MSC_VER < 1300) 
 #  error "Only Microsoft Visual Studio 7.0 and later are supported." 
 #endif