Remove default /EHsc compiler flag
Remove default /EHsc compiler flag

This prevents warning D9025 (one command-line option overrides
another) on MSVC builds: some test targets are built with
the /EHs-c- which conflicts with /EHsc.

xnagireddy/googletest,empiredan/googletest,google/googletest,jlanecox/googletest,antidotcb/googletest,gianricardo/googletest,gianricardo/googletest,antidotcb/googletest,antidotcb/googletest,jlanecox/googletest,gianricardo/googletest,google/googletest,google/googletest,google/googletest,empiredan/googletest,xnagireddy/googletest,jlanecox/googletest,empiredan/googletest,antidotcb/googletest,jlanecox/googletest,xnagireddy/googletest,xnagireddy/googletest