pv-per-arch-dirs: Also check for Clear Linux/Solus FHS variant
Vaguely related to https://github.com/ValveSoftware/steam-runtime/issues/642, not yet tested.
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pv-per-arch-dirs: Only compile Arch directory scheme on x86
On non-x86 architectures, it's equivalent to Red-Hat-style FHS, so having one or the other is enough.
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pv-per-arch-dirs: Add FHS variant that always uses libQUAL
According to steam-runtime#642, Clear Linux uses lib64 for 64-bit libraries (like Red Hat) and lib32 for 32-bit libraries (like Arch), and according to !645 (merged), Solus does the same. Give these their own directory scheme that is a mixture of Red Hat and Arch.
/cc @denittis
Edited by Simon McVittie