[Bug jit/106312] jit tests fail on powerpc64le

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106312

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Ah, I have quite old versions of the prerequisite libs:

lrwxrwxrwx. 1 jwakely jwakely 12 Feb 17  2017 gmp -> ./gmp-6.1.0/
lrwxrwxrwx. 1 jwakely jwakely 12 Feb 17  2017 mpc -> ./mpc-1.0.3/
lrwxrwxrwx. 1 jwakely jwakely 13 Feb 17  2017 mpfr -> ./mpfr-3.1.4/

I've removed those symlinks and run contrib/download_prerequisites again and am
rebuilding now.

If this fixes it, we might need to document that mpfr 3.1.0 is no longer
sufficient for GCC: https://gcc.gnu.org/install/prerequisites.html