Correct compilation breakage of r63832.

wx/setup.h can't use wxCHECK_VISUALC_VERSION() which is defined in
wx/platform.h _after_ wx/setup.h inclusion.

Replace wxCHECK_VISUALC_VERSION() with manual tests for _MSC_VER.

Also add more comments to explain what's going on.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63842 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

setup.h.in

@@ -323,10 +323,24 @@
 #define wxUSE_STC 0
 
 
-#if !defined(__WXMSW__) || wxCHECK_VISUALC_VERSION(7)
-    #define wxUSE_GRAPHICS_CONTEXT 0
+
+#ifdef _MSC_VER
+#   if _MSC_VER >= 1400
+
+
+#define wxUSE_GRAPHICS_CONTEXT 0
+#   else
+
+
+#       define wxUSE_GRAPHICS_CONTEXT 0
+#   endif
 #else
-    #define wxUSE_GRAPHICS_CONTEXT 0
+
+
+
+
+
+#   define wxUSE_GRAPHICS_CONTEXT 0
 #endif