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

src/lib9/utf/rune.c

@@ -37,7 +37,7 @@ enum
 	Maskx	= (1<<Bitx)-1,			/* 0011 1111 */
 	Testx	= Maskx ^ 0xFF,			/* 1100 0000 */
 
-	Bad	= Runeerror,
+	Bad	= Runeerror
 };
 
 int

src/lib9/utf/utfecpy.c

@@ -11,6 +11,7 @@
  * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
  * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
  */
+#define _BSD_SOURCE 1	/* memccpy */
 #include <stdarg.h>
 #include <string.h>
 #include "plan9.h"