clover/spirv: rework handling of spirv extensions

What extensions we support depends on spirv_to_nir but it doesn't give us a
list. So hardcode one and add extensions we know we support and hit in the
wild.

Signed-off-by: Karol Herbst <kherbst@redhat.com>
31 jobs for !6333 with clover_spirv_extensions
detached
Status Job ID Name Coverage
  Container+Docs
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aarch64 manual
arm_build
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arm_test-base
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arm64_test
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i386_build
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kernel+rootfs_amd64
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ppc64el_build
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meson-android
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meson-clang
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meson-classic
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meson-clover
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meson-clover-old-llvm
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meson-testing
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scons-win64
 
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aarch64
meson-arm64
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meson-arm64-build-test
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meson-armhf
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meson-i386
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