[libc-commits] [libc] [libc] avoid c++ includes from MPFR (PR #87693)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

If we want to support fuzzing against full build mode, then we should rebuild MPFR against our libc rather than the system libc.  Otherwise libc/fuzzing/ is in some twighlight zone half way between full build and overlay mode. I don't want to support that.

https://github.com/llvm/llvm-project/pull/87693