use os sensitive comparer in GitUtility (#1288)
use os sensitive comparer in GitUtility (#1288)


DuncanmaMSFT/docfx,pascalberger/docfx,hellosnow/docfx,superyyrrzz/docfx,dotnet/docfx,928PJY/docfx,pascalberger/docfx,LordZoltan/docfx,LordZoltan/docfx,DuncanmaMSFT/docfx,dotnet/docfx,928PJY/docfx,pascalberger/docfx,LordZoltan/docfx,hellosnow/docfx,928PJY/docfx,LordZoltan/docfx,superyyrrzz/docfx,superyyrrzz/docfx,hellosnow/docfx,dotnet/docfx