xz: update to 5.0.0, provide liblzma{,-devel} subpkgs. Bump abi_depends.
--HG-- rename : srcpkgs/xz/xz-devel.template => srcpkgs/xz/liblzma-devel.template
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--HG-- rename : srcpkgs/xz/xz-devel.template => srcpkgs/xz/liblzma-devel.template