increase max number arguments to cpp macro from 32 to 128
which should be enough, even for freetype.

Reference: /n/sources/patch/applied/cpp-narg
Date: Sun Jul 15 23:16:43 CES 2012
Signed-off-by: forsyth@terzarima.net

--- /sys/src/cmd/cpp/cpp.h	Sun Jul 15 23:16:28 2012
+++ /sys/src/cmd/cpp/cpp.h	Sun Jul 15 23:16:26 2012
@@ -1,6 +1,6 @@
 #define	INS	32768		/* input buffer */
 #define	OBS	4096		/* outbut buffer */
-#define	NARG	32		/* Max number arguments to a macro */
+#define	NARG	128		/* Max number arguments to a macro */
 #define	NINCLUDE 64		/* Max number of include directories (-I) */
 #define	NIF	32		/* depth of nesting of #if */
 #ifndef EOF