Add FreeBSD DRI build targets.  Doesn't build at the moment, due to the same
problems as Linux.
diff --git a/Makefile b/Makefile
index 864ee98..beb1bd7 100644
--- a/Makefile
+++ b/Makefile
@@ -52,6 +52,8 @@
 darwin \
 darwin-static \
 freebsd \
+freebsd-dri \
+freebsd-dri-x86 \
 hpux10 \
 hpux10-gcc \
 hpux10-static \