Added #include<unistd.h> to compile with solaris gcc3.2


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4042 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Timer.cpp b/lib/Support/Timer.cpp
index fa48445..fb38fcb 100644
--- a/lib/Support/Timer.cpp
+++ b/lib/Support/Timer.cpp
@@ -8,6 +8,7 @@
 #include <sys/resource.h>
 #include <sys/time.h>
 #include <sys/unistd.h>
+#include <unistd.h>
 #include <stdio.h>
 #include <iostream>
 #include <algorithm>