gold work on mingw/mingw64 support

[Ian Lance Taylor]

Vladimir Simonov <sv@sw.ru> writes:

> The only I can say from the first glance - chunk from top-level
> config/mh-mingw about CXXFLAGS += -D__USE_MINGW_ACCESS is missed.
> It is below.
> Cause gold is the only c++ program in binutils
> I see no reasons against it.

Why is it necessary?  What difference does it make?  Note that gold
never calls access().

Ian