Log Message:
xetex uses graphite2, so it should pull in graphics/graphite2/buildlink3.mk

XXX: even with this, it will not build if LIBRSVG_TYPE=c.
the error is a missing include file: include/harfbuzz/hb-graphite2.h
this is because fonts/harfbuzz excludes graphics/graphite2 when
LIBRSVG_TYPE=c to work around some problem building libreoffice.
see rev 1.112 of fonts/harfbuzz/Makefile