[Bug preprocessor/20078] Gcc doesn't complain about non-benign macro definitions

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=20078
Bug 20078 depends on bug 27797, which changed state.

Bug 27797 Summary: win32.cc: FormatMessage fails on win98 for network messages
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=27797

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |WONTFIX