Rollup merge of #143409 - Gelbpunkt:xgot-mips64-musl, r=compiler-errors

Enable xgot feature for mips64 musl targets

This was missed in b65c2af, which only enabled it for the glibc targets.

I didn't feel comfortable touching the OpenWRT target, whoever maintains that will probably want to take a look whether it is necessary there as well.

Author: fmease