[Bug target/121971] [15/16 Regression] Only warn about musttail on exotic targets?

[ak at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121971

ak at gcc dot gnu.org changed:

           What    |Removed                     |Added
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                 CC|                            |ak at gcc dot gnu.org

--- Comment #5 from ak at gcc dot gnu.org ---
An option would be to make __has_attribute musttail return 0 on those targets.
Just warning is a bad idea because with deep recursion it eill generate
incorrect code (guaranteed stack overflow)