XCode 8.1 build failure on gmock-actions.h due to missing user constructor for ExcessiveArg type

[dneto0]

A colleague using XCode 8.1 reports a build failure

In file included from /Users/dkoch/khronos/github/glslang/External/googletest/googlemock/src/gmock-all.cc:39:
In file included from /Users/dkoch/khronos/github/glslang/External/googletest/googlemock/include/gmock/gmock.h:59:
/Users/dkoch/khronos/github/glslang/External/googletest/googlemock/include/gmock/gmock-actions.h:1523:31: error: 
      default initialization of an object of const type 'const testing::internal::ExcessiveArg' without a
      user-provided default constructor
    static const ExcessiveArg kExcessArg;
                              ^
                                        {}
1 error generated.

This appears to be caused by fbef071

[dneto0]

cc: @dgkoch

[greg-lunarg]

This is also a problem with glslang Travis CI build. See KhronosGroup/glslang#2472

[juan-lunarg]

@asoffer feel free to close this issue. Or any other google test maintainer (@dinord / @derekmauro ). The original reason it was opened doesn't exist anymore.