missing ulong -> uintptr change

Reference: /n/sources/patch/applied/dt-getcallpcamd64
Date: Mon May 22 07:46:01 CES 2006
Signed-off-by: xigh@free.fr

--- /sys/src/cmd/unix/drawterm/posix-amd64/getcallerpc.c	Mon May 22 07:45:37 2006
+++ /sys/src/cmd/unix/drawterm/posix-amd64/getcallerpc.c	Mon May 22 07:45:34 2006
@@ -1,7 +1,7 @@
 #include "u.h"
 #include "libc.h"
 
-ulong
+uintptr
 getcallerpc(void *a)
 {
 	return ((ulong*)a)[-1];