Adding a more comprehensive warning message if "CreateDC" failed, per e-mail from Eero Pajarre dated 1/29/10, 5:26 AM

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@873 7f0cb862-5218-0410-a997-914c9d46530a

freeglut/freeglut/src/freeglut_init.c

@@ -377,7 +377,8 @@ static void fghInitialize( const char* displayName )
         }
         else
 	    fgWarning("fghInitialize: "
-		      "CreateDC failed, Screen size info may be incorrect");
+		      "CreateDC failed, Screen size info may be incorrect\n"
+          "This is quite likely caused by a bad '-display' parameter");
       
     }
     /* Set the timer granularity to 1 ms */