st/glx: remove the duplicated Drawable member.

If you want to access it, you should use the Drawable in xlib_drawable instead.

src/gallium/state_trackers/glx/xlib/glx_api.c

    if (!b) {
       return 0;
    }
-   return b->drawable;
+   return b->ws.drawable;
 }
 
 
    if (!b) {
       return 0;
    }
-   return b->drawable;
+   return b->ws.drawable;
 }
 
 
    if (xmbuf) {
       xmbuf->largestPbuffer = useLargest;
       xmbuf->preservedContents = preserveContents;
-      return (GLXPbuffer) xmbuf->drawable;
+      return (GLXPbuffer) xmbuf->ws.drawable;
    }
    else {
       return 0;
 {
    XMesaVisual xmvis = (XMesaVisual) config;
    XMesaBuffer xmbuf = XMesaCreatePixmapBuffer(xmvis, pixmap, 0);
-   return xmbuf->drawable; /* need to return an X ID */
+   return xmbuf->ws.drawable; /* need to return an X ID */
 }
 
 
    /* A GLXPbuffer handle must be an X Drawable because that's what
     * glXMakeCurrent takes.
     */
-   return (GLXPbuffer) xmbuf->drawable;
+   return (GLXPbuffer) xmbuf->ws.drawable;
 }
 
 

src/gallium/state_trackers/glx/xlib/xm_api.c

    if (!b)
       return NULL;
 
-   b->ws.drawable = b->drawable = d;
+   b->ws.drawable = d;
    b->ws.visual = vis->visinfo->visual;
    b->ws.depth = vis->visinfo->depth;
 

src/gallium/state_trackers/glx/xlib/xm_api.h

 
    GLboolean wasCurrent;	/* was ever the current buffer? */
    XMesaVisual xm_visual;	/* the X/Mesa visual */
-   Drawable drawable;	/* Usually the X window ID */
    Colormap cmap;		/* the X colormap */
    BufferType type;             /* window, pixmap, pbuffer or glxwindow */