speed up building gcj by disabling gcc bootstrap (since gcc from here is not used anyway, pointless)

Signed-off-by: Thorsten Glaser <tg@mirbsd.org>

jtools/gcj/Makefile

@@ -27,6 +27,7 @@ $(WRKBUILD)/.configured: ${WRKDIST}/.prepared
                         --disable-biarch \
                         --disable-decimal-float \
                         --disable-multilib \
+			--disable-bootstrap \
 	);
 	touch $@