This header includes libxfont2.h, but the dependency isn't stated anywhere,
causing some drivers to FTBS (when libxont2.h is in non-standard location).
Since this header doesn't seem to need including libxfont2.h at all, just
stop including it, instead of adding yet another dependency to server SDK.
Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1610>