[PATCH] [MIPS] Add missing header for syscall

[Petar Jovanovic]

The syscall function itself is declared in <unistd.h>
Compiling compiler-rt with -Werror-implicit-function-declaration will
cause a build failure. This change fixes it.

http://reviews.llvm.org/D7949

Files:
  lib/builtins/clear_cache.c

Index: lib/builtins/clear_cache.c
===================================================================
--- lib/builtins/clear_cache.c
+++ lib/builtins/clear_cache.c
@@ -25,6 +25,7 @@
 #if defined(__mips__)
   #include <sys/cachectl.h>
   #include <sys/syscall.h>
+  #include <unistd.h>
   #if defined(__ANDROID__) && defined(__LP64__)
     /*
      * clear_mips_cache - Invalidates instruction cache for Mips.

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