Regenerate the system call stubs (to get x86_64).

This touches the x86 stubs too because arm, x86, and x86_64 now
all share the same header (at a source level), which causes a
reordering of the #include lines.

Change-Id: If9a1e2b2718bd41d8399fea748bce672c513ef84
diff --git a/libc/arch-x86/syscalls/setpriority.S b/libc/arch-x86/syscalls/setpriority.S
index 973302e..5a32678 100644
--- a/libc/arch-x86/syscalls/setpriority.S
+++ b/libc/arch-x86/syscalls/setpriority.S
@@ -1,7 +1,7 @@
 /* autogenerated by gensyscalls.py */
+#include <asm/unistd.h>
 #include <linux/err.h>
 #include <machine/asm.h>
-#include <asm/unistd.h>
 
 ENTRY(setpriority)
     pushl   %ebx