XAA PixmapOps: Sync before accessing unwrapped callbacks.

When using any XAAPixmapOps, we call into unknown but freshly
unwrapped callbacks (like fb ones). Unlike the XAA*Fallback calls,
we did so without syncing first, exposing us to all kinds of
synchronisation issues.

I believe that the rendering errors appeared now because *PaintWindow
vanished (e4d11e58), and we just use miPaintWindow instead. This
takes a less direct route to the hw and ends up at
PolyFillRectPixmap, which very often left drawing artifacts.

We now sync accordingly, and no longer get the rendering artifacts i
was methodically reproducing on radeonhd, radeon, unichrome...

Also, in order to allow driver authors to remove extensive syncing
or flushing to hide this issue, create XAA_VERSION_ defines, put
them in xaa.h and bump the patchlevel.

(novell bug #435791)

hw/xfree86/xaa/xaa.h

@@ -2,6 +2,10 @@
 #ifndef _XAA_H
 #define _XAA_H
 
+#define XAA_VERSION_MAJOR   1
+#define XAA_VERSION_MINOR   2
+#define XAA_VERSION_RELEASE 1
+
 /*
 
    ******** OPERATION SPECIFIC FLAGS *********

hw/xfree86/xaa/xaaInitAccel.c

@@ -100,7 +100,9 @@ static XF86ModuleVersionInfo xaaVersRec =
 	MODINFOSTRING1,
 	MODINFOSTRING2,
 	XORG_VERSION_CURRENT,
-	1, 2, 0,
+	XAA_VERSION_MAJOR,
+	XAA_VERSION_MINOR,
+	XAA_VERSION_RELEASE,
 	ABI_CLASS_VIDEODRV,		/* requires the video driver ABI */
 	ABI_VIDEODRV_VERSION,
 	MOD_CLASS_NONE,

hw/xfree86/xaa/xaawrap.h

@@ -48,8 +48,8 @@
     XAAPixmapPtr pixPriv = XAA_GET_PIXMAP_PRIVATE((PixmapPtr)(pDraw));\
     GCFuncs *oldFuncs = pGC->funcs;\
     pGC->funcs = pGCPriv->wrapFuncs;\
-    pGC->ops = pGCPriv->wrapOps
-
+    pGC->ops = pGCPriv->wrapOps; \
+    SYNC_CHECK(pGC)
     
 #define XAA_PIXMAP_OP_EPILOGUE(pGC)\
     pGCPriv->wrapOps = pGC->ops;\