deanon: This now builds without -fplan9-extensions and with clang

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

sys/include/scribble.h

@@ -16,7 +16,7 @@ typedef struct Scribble Scribble;
 typedef struct graffiti Graffiti;
 
 typedef struct pen_point {
-	Point;
+	Point Point;
 	long	chaincode;
 } pen_point;
 

sys/src/libcontrol/libcontrol.json

@@ -1,7 +1,6 @@
 {
 	"libcontrol": {
 		"Cflags": [
-		    "-fplan9-extensions",
 			"-Werror"
 		],
 		"Include": [