[Bug target/63773] [meta-bug] Restoring darwin bootstrap for gcc 5.0

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63773
Bug 63773 depends on bug 63831, which changed state.

Bug 63831 Summary: [5 Regression] r217292 causes segfaults with -MM
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63831

           What    |Removed                     |Added
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             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED