Make mips/mips64 syscall stubs more like the other architectures.

Change-Id: I55f8c1a95f643a6e484f12fbcc25e2c77e55b6b8
diff --git a/libc/arch-mips64/syscalls/__rt_sigaction.S b/libc/arch-mips64/syscalls/__rt_sigaction.S
index ef537a4..2e8d588 100644
--- a/libc/arch-mips64/syscalls/__rt_sigaction.S
+++ b/libc/arch-mips64/syscalls/__rt_sigaction.S
@@ -1,14 +1,8 @@
 /* Generated by gensyscalls.py. Do not edit. */
 
-#include <asm/unistd.h>
-#include <machine/asm.h>
-#include <machine/regdef.h>
-    .text
-    .globl __rt_sigaction
-    .align 4
-    .ent __rt_sigaction
+#include <private/bionic_asm.h>
 
-__rt_sigaction:
+ENTRY(__rt_sigaction)
     .set push
     .set noreorder
     li v0, __NR_rt_sigaction
@@ -28,5 +22,5 @@
     j t9
     move ra, t0
     .set pop
-    .end __rt_sigaction
+END(__rt_sigaction)
 .hidden _C_LABEL(__rt_sigaction)