Use gcc -ansi -pedantic in 9c. Fix many non-C89-isms.

include/utf.h

@@ -11,7 +11,7 @@ enum
 	UTFmax		= 3,		/* maximum bytes per rune */
 	Runesync	= 0x80,		/* cannot represent part of a UTF sequence (<) */
 	Runeself	= 0x80,		/* rune and UTF sequences are the same (<) */
-	Runeerror	= 0xFFFD,		/* decoding error in UTF */
+	Runeerror	= 0xFFFD		/* decoding error in UTF */
 };
 
 /* Edit .+1,/^$/ | cfn $PLAN9/src/lib9/utf/?*.c | grep -v static |grep -v __ */