Add a few missing headers.

Fixes build with gcc 4.3.2 on Debian.

Signed-off-by: Alexey Zaytsev <alexey.zaytsev@gmail.com>
diff --git a/tools/localize/Perforce.cpp b/tools/localize/Perforce.cpp
index 3184dfc..c702690 100644
--- a/tools/localize/Perforce.cpp
+++ b/tools/localize/Perforce.cpp
@@ -3,6 +3,8 @@
 #include <sstream>
 #include <sys/types.h>
 #include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
 #include <sys/wait.h>
 
 using namespace std;