vga: always rebuild libdraw and libmemdraw

it's fast. Once we have the new build it won't matter.

Change-Id: Ie113f03fde5db50198a97086e25bce52f52a3103
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>

sys/src/9/amd64/core.json

@@ -49,7 +49,9 @@
 		"Projects": [
 			"clean.json",
 			"../boot/bootconf.json",
-			"inith.json"
+			"inith.json",
+			"/sys/src/libmemdraw/klibmemdraw.json",
+			"/sys/src/libdraw/klibdraw.json"
 		],
 		"SourceFiles": [
 			"entry.S",