README.md - move CLMUL to partial, list more of the CI.yml architectures

[Torinde]

Per #1152 (comment)

Should the following two architectures also be added?

• ARMv8 SVE - it's in simde-features.h, but I couldn't find it in ci.yml
• z/Architecture ZVECTOR - it's in simde-features.h, but ci.yml just lists s390x, so unclear if ZVECTOR extensions are utilized

[mr-c]

• ARMv8 SVE - it's in simde-features.h, but I couldn't find it in ci.yml

That's correct, it isn't currently under any test

• z/Architecture ZVECTOR - it's in simde-features.h, but ci.yml just lists s390x, so unclear if ZVECTOR extensions are utilized

Looking at .github/workflows/ci.yml

simde/.github/workflows/ci.yml

Lines 411 to 414 in 517da84

	- version: 12
	cross: s390x
	arch_gnu: s390x
	arch_deb: s390x

which gets combined with

simde/.github/workflows/ci.yml

Line 452 in 517da84

run: meson setup --cross-file=docker/cross-files/${{ matrix.cross }}-gcc-${{ matrix.version }}${{ matrix.extra}}-ccache.cross build

Therefore we check https://github.com/simd-everywhere/simde/blob/master/docker/cross-files/s390x-gcc-12-ccache.cross and find

simde/docker/cross-files/s390x-gcc-12-ccache.cross

Lines 11 to 12 in 517da84

	c_args = ['-march=z13', '-mzvector', '-Wextra', '-Werror']
	cpp_args = ['-march=z13', '-mzvector', '-Wextra', '-Werror']

So yes, s390x with zvector is tested in CI ; woohoo!

[Torinde]

Great. Can you please add "ZVECTOR" to the z/Architecture line - before merging?