compiler-rt: Fix warning if COMPILER_RT_HAS_FCNTL_LCK is 0

Fixes "warning: implicit declaration of function 'flock' is invalid in C99"
for flock().

llvm-svn: 369534

compiler-rt/lib/profile/InstrProfilingUtil.c

@@ -12,6 +12,7 @@
 #include <windows.h>
 #include "WindowsMMap.h"
 #else
+#include <sys/file.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>