fixed warnings about main used as a variable name

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15238 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/jpeg/jdmainct.c

@@ -13,11 +13,13 @@
  * supplies the equivalent of the main buffer in that case.
  */
 
+/* suppress the warnings about using main for the variable names */
+#define main jpegMain
+
 #define JPEG_INTERNALS
 #include "jinclude.h"
 #include "jpeglib.h"
 
-
 /*
  * In the current system design, the main buffer need never be a full-image
  * buffer; any full-height buffers will be found inside the coefficient or