Add Xtrans definitions (FONT_t, TRANS_CLIENT) to clean up warnings.

Add XSERV_t, TRANS_SERVER, TRANS_REOPEN to quash warnings.
Add #include <dix-config.h> or <xorg-config.h>, as appropriate, to all
    source files in the xserver/xorg tree, predicated on defines of
    HAVE_{DIX,XORG}_CONFIG_H. Change all Xfont includes to
    <X11/fonts/foo.h>.

Xext/xf86bigfont.c

@@ -35,6 +35,10 @@
  * XLoadQueryFont).
  */
 
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
 #include <sys/types.h>
 #ifdef HAS_SHM
 #if defined(linux) && (!defined(__GNU_LIBRARY__) || __GNU_LIBRARY__ < 2)