Cleanup duplicate include

Summary:
Included climits and limits.h due to non-conflicting changes,
clean this up.

Test Plan: compiled

Reviewed By: kelarini@fb.com

Subscribers: trunkagent, folly-diffs@

FB internal diff: D1810133

Signature: t1:1810133:1422483209:0826d2198769efed86607de6c5b28ce0bc4ac04b

folly/Range.h

@@ -24,11 +24,10 @@
 #include <folly/FBString.h>
 #include <algorithm>
 #include <boost/operators.hpp>
-#include <cstring>
 #include <climits>
+#include <cstring>
 #include <glog/logging.h>
 #include <iosfwd>
-#include <limits.h>
 #include <stdexcept>
 #include <string>
 #include <type_traits>