<bits/glibc-syscalls.h>: only regenerate when we have new uapi headers.

Test: update_all.py
Change-Id: Iaa92dce263197f5a0e7d2dce5e00a31372dcb3e9
diff --git a/libc/include/bits/glibc-syscalls.h b/libc/include/bits/glibc-syscalls.h
index 52eff56..e831bdc 100644
--- a/libc/include/bits/glibc-syscalls.h
+++ b/libc/include/bits/glibc-syscalls.h
@@ -1,6 +1,5 @@
-/* Generated by gensyscalls.py. Do not edit. */
-#ifndef _BIONIC_BITS_GLIBC_SYSCALLS_H_
-#define _BIONIC_BITS_GLIBC_SYSCALLS_H_
+/* Generated file. Do not edit. */
+#pragma once
 #if defined(__NR__llseek)
   #define SYS__llseek __NR__llseek
 #endif
@@ -61,12 +60,6 @@
 #if defined(__NR_brk)
   #define SYS_brk __NR_brk
 #endif
-#if defined(__NR_cachectl)
-  #define SYS_cachectl __NR_cachectl
-#endif
-#if defined(__NR_cacheflush)
-  #define SYS_cacheflush __NR_cacheflush
-#endif
 #if defined(__NR_capget)
   #define SYS_capget __NR_capget
 #endif
@@ -1123,9 +1116,6 @@
 #if defined(__NR_syslog)
   #define SYS_syslog __NR_syslog
 #endif
-#if defined(__NR_sysmips)
-  #define SYS_sysmips __NR_sysmips
-#endif
 #if defined(__NR_tee)
   #define SYS_tee __NR_tee
 #endif
@@ -1150,9 +1140,6 @@
 #if defined(__NR_timer_settime)
   #define SYS_timer_settime __NR_timer_settime
 #endif
-#if defined(__NR_timerfd)
-  #define SYS_timerfd __NR_timerfd
-#endif
 #if defined(__NR_timerfd_create)
   #define SYS_timerfd_create __NR_timerfd_create
 #endif
@@ -1255,4 +1242,3 @@
 #if defined(__NR_writev)
   #define SYS_writev __NR_writev
 #endif
-#endif /* _BIONIC_BITS_GLIBC_SYSCALLS_H_ */