Move #error for non-MSVC to the top of file.

This allows to reduce indentation of the rest of it and avoid a very long #if...#else.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61532 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/msvc/wx/setup.h

@@ -9,11 +9,14 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
+#ifndef _MSC_VER
+    #error "This file should only be included when using Microsoft Visual C++"
+#endif
+
 // VC++ IDE predefines _DEBUG and _UNICODE for the new projects itself, but
 // the other symbols (WXUSINGDLL, __WXUNIVERSAL__, ...) should be defined
 // explicitly!
 
-#ifdef _MSC_VER
 #include "wx/version.h"
 #include "wx/cpp.h"
 
@@ -135,7 +138,3 @@
         #pragma comment(lib, wx3RD_PARTY_LIB_NAME("scintilla"))
     #endif
 #endif // wxUSE_GUI
-#else
-    #error "This file should only be included when using Microsoft Visual C++"
-#endif
-