Include portabilty/String.h for strndup and strcasecmp

Summary: Windows needs it

Reviewed By: yfeldblum

Differential Revision: D23497837

fbshipit-source-id: e4fa8fadb3a7ac26e602ff5fbddaef0976d47b0d

folly/io/async/test/AsyncSSLSocketTest.h

@@ -34,6 +34,7 @@
 #include <folly/portability/GTest.h>
 #include <folly/portability/PThread.h>
 #include <folly/portability/Sockets.h>
+#include <folly/portability/String.h>
 #include <folly/portability/Unistd.h>
 
 #include <fcntl.h>

folly/test/AtomicHashArrayTest.cpp

@@ -24,6 +24,7 @@
 #include <folly/Memory.h>
 #include <folly/hash/Hash.h>
 #include <folly/portability/GTest.h>
+#include <folly/portability/String.h>
 #include <folly/portability/SysMman.h>
 
 using namespace std;