Fix MacOSX build failure
Fix MacOSX build failure

While building tensorflow on MaxOSX
(`Apple LLVM version 10.0.0 (clang-1000.11.45.2)`, `Python 2.7.10`)
the following build failure surfaced:
```
In file included from tensorflow/python/eager/pywrap_tfe_src.cc:18:
In file included from ./tensorflow/python/eager/pywrap_tfe.h:22:
In file included from ./tensorflow/core/lib/core/status.h:23:
In file included from bazel-out/host/genfiles/tensorflow/core/lib/core/error_codes.pb.h:9:
In file included from external/protobuf_archive/src/google/protobuf/stubs/common.h:39:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/iostream:38:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/ios:216:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/__locale:518:15: error: C++ requires a type specifier for all declarations
    char_type toupper(char_type __c) const
              ^
bazel-out/host/genfiles/external/local_config_python/python_include/pyport.h:731:29: note: expanded from macro 'toupper'
```

This fix fixes the build failure.

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>

renyi533/tensorflow,alsrgv/tensorflow,ghchinoy/tensorflow,chemelnucfin/tensorflow,Intel-tensorflow/tensorflow,jhseu/tensorflow,petewarden/tensorflow,adit-chandra/tensorflow,Intel-tensorflow/tensorflow,kevin-coder/tensorflow-fork,jbedorf/tensorflow,theflofly/tensorflow,jbedorf/tensorflow,freedomtan/tensorflow,ghchinoy/tensorflow,jendap/tensorflow,annarev/tensorflow,annarev/tensorflow,gunan/tensorflow,alsrgv/tensorflow,DavidNorman/tensorflow,ageron/tensorflow,frreiss/tensorflow-fred,tensorflow/tensorflow,brchiu/tensorflow,brchiu/tensorflow,hehongliang/tensorflow,yongtang/tensorflow,Intel-Corporation/tensorflow,yongtang/tensorflow,freedomtan/tensorflow,renyi533/tensorflow,karllessard/tensorflow,alsrgv/tensorflow,apark263/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,cxxgtxy/tensorflow,ghchinoy/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_saved_model,apark263/tensorflow,cxxgtxy/tensorflow,arborh/tensorflow,ghchinoy/tensorflow,hfp/tensorflow-xsmm,brchiu/tensorflow,jhseu/tensorflow,brchiu/tensorflow,sarvex/tensorflow,tensorflow/tensorflow-pywrap_saved_model,Intel-tensorflow/tensorflow,ghchinoy/tensorflow,kevin-coder/tensorflow-fork,petewarden/tensorflow,ageron/tensorflow,frreiss/tensorflow-fred,asimshankar/tensorflow,brchiu/tensorflow,adit-chandra/tensorflow,dongjoon-hyun/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,petewarden/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,davidzchen/tensorflow,gautam1858/tensorflow,davidzchen/tensorflow,gunan/tensorflow,arborh/tensorflow,adit-chandra/tensorflow,davidzchen/tensorflow,seanli9jan/tensorflow,arborh/tensorflow,alsrgv/tensorflow,gunan/tensorflow,Intel-Corporation/tensorflow,arborh/tensorflow,jbedorf/tensorflow,asimshankar/tensorflow,ageron/tensorflow,Intel-Corporation/tensorflow,gautam1858/tensorflow,davidzchen/tensorflow,xzturn/tensorflow,ghchinoy/tensorflow,jendap/tensorflow,jbedorf/tensorflow,Intel-tensorflow/tensorflow,seanli9jan/tensorflow,frreiss/tensorflow-fred,brchiu/tensorflow,paolodedios/tensorflow,adit-chandra/tensorflow,hehongliang/tensorflow,arborh/tensorflow,davidzchen/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow,karllessard/tensorflow,xzturn/tensorflow,ppwwyyxx/tensorflow,jhseu/tensorflow,aam-at/tensorflow,DavidNorman/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,ageron/tensorflow,petewarden/tensorflow,jendap/tensorflow,arborh/tensorflow,Intel-tensorflow/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,theflofly/tensorflow,jbedorf/tensorflow,ageron/tensorflow,Intel-Corporation/tensorflow,chemelnucfin/tensorflow,dongjoon-hyun/tensorflow,sarvex/tensorflow,aam-at/tensorflow,arborh/tensorflow,yongtang/tensorflow,hfp/tensorflow-xsmm,asimshankar/tensorflow,tensorflow/tensorflow,aldian/tensorflow,hfp/tensorflow-xsmm,adit-chandra/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Bismarrck/tensorflow,karllessard/tensorflow,sarvex/tensorflow,arborh/tensorflow,tensorflow/tensorflow,tensorflow/tensorflow-pywrap_saved_model,renyi533/tensorflow,dongjoon-hyun/tensorflow,freedomtan/tensorflow,hfp/tensorflow-xsmm,jendap/tensorflow,gunan/tensorflow,kevin-coder/tensorflow-fork,jbedorf/tensorflow,kevin-coder/tensorflow-fork,aam-at/tensorflow,ppwwyyxx/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-experimental_link_static_libraries_once,DavidNorman/tensorflow,freedomtan/tensorflow,annarev/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,davidzchen/tensorflow,Bismarrck/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,alsrgv/tensorflow,cxxgtxy/tensorflow,aldian/tensorflow,davidzchen/tensorflow,petewarden/tensorflow,arborh/tensorflow,frreiss/tensorflow-fred,xzturn/tensorflow,DavidNorman/tensorflow,karllessard/tensorflow,gautam1858/tensorflow,tensorflow/tensorflow,paolodedios/tensorflow,seanli9jan/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,renyi533/tensorflow,xzturn/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,dongjoon-hyun/tensorflow,ageron/tensorflow,brchiu/tensorflow,alsrgv/tensorflow,jbedorf/tensorflow,brchiu/tensorflow,jhseu/tensorflow,jendap/tensorflow,theflofly/tensorflow,hehongliang/tensorflow,apark263/tensorflow,gunan/tensorflow,Intel-tensorflow/tensorflow,freedomtan/tensorflow,DavidNorman/tensorflow,aldian/tensorflow,asimshankar/tensorflow,DavidNorman/tensorflow,apark263/tensorflow,gautam1858/tensorflow,renyi533/tensorflow,paolodedios/tensorflow,tensorflow/tensorflow-pywrap_saved_model,jendap/tensorflow,hehongliang/tensorflow,adit-chandra/tensorflow,freedomtan/tensorflow,theflofly/tensorflow,kevin-coder/tensorflow-fork,kevin-coder/tensorflow-fork,asimshankar/tensorflow,DavidNorman/tensorflow,chemelnucfin/tensorflow,ghchinoy/tensorflow,jbedorf/tensorflow,cxxgtxy/tensorflow,Intel-tensorflow/tensorflow,frreiss/tensorflow-fred,ageron/tensorflow,gautam1858/tensorflow,karllessard/tensorflow,paolodedios/tensorflow,karllessard/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andra/tensorflow,cxxgtxy/tensorflow,jhseu/tensorflow,Bismarrck/tensorflow,kevin-coder/tensorflow-fork,xzturn/tensorflow,chemelnucfin/tensorflow,renyi533/tensorflow,aam-at/tensorflow,gautam1858/tensorflow,gautam1858/tensorflow,hehongliang/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,tensorflow/tensorflow,aam-at/tensorflow,hehongliang/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,apark263/tensorflow,davidzchen/tensorflow,gunan/tensorflow,Intel-Corporation/tensorflow,seanli9jan/tensorflow,karllessard/tensorflow,ageron/tensorflow,tensorflow/tensorflow,aam-at/tensorflow,aam-at/tensorflow,kevin-coder/tensorflow-fork,theflofly/tensorflow,annarev/tensorflow,chemelnucfin/tensorflow,hfp/tensorflow-xsmm,alsrgv/tensorflow,tensorflow/tensorflow,xzturn/tensorflow,renyi533/tensorflow,theflofly/tensorflow,yongtang/tensorflow,ppwwyyxx/tensorflow,frreiss/tensorflow-fred,jhseu/tensorflow,dongjoon-hyun/tensorflow