Fixes definitions from pthread.h used before the header inclusion.

include/gtest/internal/gtest-port.h

@@ -379,6 +379,12 @@
 #define GTEST_HAS_PTHREAD (GTEST_OS_LINUX || GTEST_OS_MAC)
 #endif  // GTEST_HAS_PTHREAD
 
+#if GTEST_HAS_PTHREAD
+// gtest-port.h guarantees to #include <pthread.h> when GTEST_HAS_PTHREAD is
+// true.
+#include <pthread.h>
+#endif
+
 // Determines whether Google Test can use tr1/tuple.  You can define
 // this macro to 0 to prevent Google Test from using tuple (any
 // feature depending on tuple with be disabled in this mode).
@@ -1089,10 +1095,6 @@ class ThreadWithParam : public ThreadWithParamBase {
   GTEST_DISALLOW_COPY_AND_ASSIGN_(ThreadWithParam);
 };
 
-// gtest-port.h guarantees to #include <pthread.h> when GTEST_HAS_PTHREAD is
-// true.
-#include <pthread.h>
-
 // MutexBase and Mutex implement mutex on pthreads-based platforms. They
 // are used in conjunction with class MutexLock:
 //