[Bug bootstrap/50156] in-tree CLooG is not picked up by toplevel configure

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50156
Bug 50156 depends on bug 50139, which changed state.

Bug 50139 Summary: in-tree GMP/PPL/CLooG is misconfigured
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50139

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