fix silly bug with ape/stdlib.h which caused ape/lib/regexp/regcomp.c to miscompile
regular expressions with runes > 0xffff.

Reference: /n/atom/patch/applied/apestdlibbigrune
Date: Tue Sep 29 06:19:05 CES 2015
Signed-off-by: quanstro@quanstro.net

--- /sys/include/ape/stdlib.h	Tue Sep 29 06:18:11 2015
+++ /sys/include/ape/stdlib.h	Tue Sep 29 06:18:12 2015
@@ -6,7 +6,7 @@
 
 #define EXIT_FAILURE 1
 #define EXIT_SUCCESS 0
-#define MB_CUR_MAX 3
+#define MB_CUR_MAX 4
 #define RAND_MAX 32767
 #define ATEXIT_MAX 32