APE incarnation of libdraw needs external "_BIND" instead of "bind".

Reference: /n/sources/patch/applied/ape-draw-bind
Date: Wed Oct 23 07:53:40 CES 2013
Signed-off-by: yarikos@gmail.com

--- /sys/src/ape/lib/draw/libc.h	Wed Oct 23 07:53:18 2013
+++ /sys/src/ape/lib/draw/libc.h	Wed Oct 23 07:53:14 2013
@@ -126,6 +126,7 @@
 #define readn _READN
 #define mallocz _MALLOCZ
 #define iounit	_IOUNIT
+#define bind _BIND
 
 /* assume being called as in event.c */
 #define postnote(x, pid, msg) kill(pid, SIGTERM)