[Bug driver/20705] -pthread should enable all options required to use pthreads on all platforms

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=20705
Bug 20705 depends on bug 28838, which changed state.

Bug 28838 Summary: LIB_SPECS lacks pthread
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28838

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