mesa3d: requires host-bison and host-flex

Fixes a local build failure when testing other things.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/x11r7/mesa3d/mesa3d.mk

@@ -30,6 +30,8 @@ MESA3D_DEPENDENCIES = \
 	expat \
 	host-xutil_makedepend \
 	host-libxml2 \
-	host-python
+	host-python \
+	host-bison \
+	host-flex
 
 $(eval $(autotools-package))