fb: Rename wfbDestroyGlyphCache

Renaming this function was missed in commit
9cbcb5bd, so both libfb.so and libwfb.so define
functions named fbDestroyGlyphCache.
Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Reviewed-by: Søren Sandmann <ssp@redhat.com>
Signed-off-by: Keith Packard <keithp@keithp.com>

fb/wfbrename.h

@@ -52,6 +52,7 @@
 #define fbCreatePixmap wfbCreatePixmap
 #define fbCreatePixmapBpp wfbCreatePixmapBpp
 #define fbCreateWindow wfbCreateWindow
+#define fbDestroyGlyphCache wfbDestroyGlyphCache
 #define fbDestroyPixmap wfbDestroyPixmap
 #define fbDestroyWindow wfbDestroyWindow
 #define fbDoCopy wfbDoCopy