add mac google libs

macx64/include/gmock/internal/custom/README.md

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+# Customization Points
+
+The custom directory is an injection point for custom user configurations.
+
+## Header `gmock-port.h`
+
+The following macros can be defined:
+
+### Flag related macros:
+
+*   `GMOCK_DECLARE_bool_(name)`
+*   `GMOCK_DECLARE_int32_(name)`
+*   `GMOCK_DECLARE_string_(name)`
+*   `GMOCK_DEFINE_bool_(name, default_val, doc)`
+*   `GMOCK_DEFINE_int32_(name, default_val, doc)`
+*   `GMOCK_DEFINE_string_(name, default_val, doc)`