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

llvm-svn: 4042
diff --git a/llvm/lib/Support/Timer.cpp b/llvm/lib/Support/Timer.cpp
index fa48445..fb38fcb 100644
--- a/llvm/lib/Support/Timer.cpp
+++ b/llvm/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>