mockcpp does not build against latest googletest 1.13

[cshaw-identiv]

The main branch of mockcpp does not build against the latest version of googletest (v1.13 onwards) when specifying gtest as the unit test framework. The build fails when building ports/failure/gtest_report_failure.cpp.o because the included gtest.h forces an error with a message about the compiler being required to support C++14.

This was seen on Windows, using both cygwin and WSL Ubuntu.

This error occurs because the mockcpp build enforces c++11 compilation. The relevant code is in src/CMakeLists.txt::83:

IF(MSVC)
    ADD_DEFINITIONS(-DMSVC_VMG_ENABLED) #  /Z7)
    SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /vmg")
	INCLUDE_DIRECTORIES(BEFORE ${MOCKCPP_SRC_ROOT}/3rdparty/msinttypes)
ELSE(MSVC)
    ADD_DEFINITIONS(-std=c++11)
ENDIF(MSVC)

When the -std flag is removed, the latest version of googletest builds without problem.
Presumably the enforcing -std flag is there for a reason, but can it be either removed completely, or removed for gtest dependency?