[PATCH] [Msan] Fix the initgroups.cc test to build on FreeBSD

[Phabricator]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9458

Files:
  compiler-rt/trunk/test/msan/initgroups.cc

Index: compiler-rt/trunk/test/msan/initgroups.cc
===================================================================
--- compiler-rt/trunk/test/msan/initgroups.cc
+++ compiler-rt/trunk/test/msan/initgroups.cc
@@ -2,6 +2,7 @@
 
 #include <sys/types.h>
 #include <grp.h>
+#include <unistd.h>  // FreeBSD declares initgroups() here.
 
 int main(void) {
   initgroups("root", 0);

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