Cleaned up a compile warning on the MAX_PATH definition.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4420 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/db/dbtest.h

@@ -25,8 +25,9 @@ enum		DialogModes {mView,mCreate,mEdit,mSearch};
 #define ABOUT_DEMO			300
 
 // this seems to be missing, Robert Roebling (?)
+#ifndef MAX_PATH
 #define MAX_PATH   200
-
+#endif
 
 // Name of the table to be created/opened
 const char	CONTACT_TABLE_NAME[]		=	"contacts";