Refactors run_tests.py s.t. it can be shared by gmock (by Vlad Losev); Fixes a warning in gtest-tuple_test.cc on Cygwin (by Vlad Losev).

test/gtest-tuple_test.cc

@@ -159,7 +159,7 @@ TEST(TupleConstructorTest, DefaultConstructorDefaultInitializesEachField) {
   b3 = a3;
   EXPECT_EQ(0.0, get<0>(b3));
   EXPECT_EQ('\0', get<1>(b3));
-  EXPECT_EQ(NULL, get<2>(b3));
+  EXPECT_TRUE(get<2>(b3) == NULL);
 
   tuple<int, int, int, int, int, int, int, int, int, int> a10, b10;
   b10 = a10;