Un-export CreateScratchGC now that nothing external uses it.

The server and drivers sometimes use GetScratchGC, but never
CreateScratchGC.

Signed-off-by: Jamey Sharp <jamey@minilop.net>
Reviewed-by: Keith Packard <keithp@keithp.com>

dix/gc.c

@@ -799,7 +799,7 @@ is what fills the default tile.  (maybe this comment should
 go with CreateGC() or ChangeGC().)
 */
 
-GCPtr
+static GCPtr
 CreateScratchGC(ScreenPtr pScreen, unsigned depth)
 {
     GCPtr pGC;

include/gc.h

@@ -122,10 +122,6 @@ extern _X_EXPORT int FreeGC(
     pointer /*pGC*/,
     XID /*gid*/);
 
-extern _X_EXPORT GCPtr CreateScratchGC(
-    ScreenPtr /*pScreen*/,
-    unsigned /*depth*/);
-
 extern _X_EXPORT void FreeGCperDepth(
     int /*screenNum*/);