meson: Raise minimum version for SPIR-V OpenCL deps (v4)

meson: Raise minimum version for SPIR-V OpenCL deps (v4)

SPIRV-LLVM-Translator had API-breaking changes during version 0.2.1.
Since the new API was being used, a higher version has to be requested.

While at it and since SPIRV-LLVM-Translator added a new API to request a
specific SPIR-V version as well as allowed SPIR-V extensions, increase
the version number to the first including those new features.

v2: Require an LLVM version which is compatible with the
    SPIRV-LLVM-Translator that was found; that requirement was
    previously implicit and would be ensured when that library was
    built. Making it explicit will help in cases where multiple versions
    of LLVM might be installed.
v3: fix use of undefined _minimum_llvmspirvlib_version_array
v4 (Karol): fix creating the minimum requested version
            Simplifing the code

Signed-off-by: Pierre Moreau <dev@pmoreau.org>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Serge Martin <edb@sigluy.net>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5038>