more MSVCRT fun

In my winelib app, most of the cpp files use MSVCRT
only, and thanks to Martin I've gotten those to compile.

A couple of my source files, however, use a mix of MSVCRT
and standard glibc (fork, exec, etc).  When I include unistd.h,
lots of function definitions conflict with msvcrt/io.h.  How can
I get this mix to compile?  Does the @ignore in the spec file
trick from the Winelib user's guide still apply, or has it been
changed (or removed altogether)?

-Steve