Risc V and gcc-13

[atupone]

See https://bugs.gentoo.org/939400

It seems that sleef (3.6.1), on Risc-V, check for SIMD instruction that belongs to the v0.11.x draft but then during build uses instructions in the v1.0.

gcc-13 only support the v0.11.x draft

I suggest checking instruction set belonging to the v1.0 (e.g. vfloat64m1x4_t)

Unfortunately I don't have a risc-v hardware to test