Update to LLVM 17.0.0 RC1
    
    This is also a squashed merge commit from upstream-snapshot (commit ID
    fe5321f2724e7e4f) into rawhide whose most important commits from
        upstream-snapshot are:
    
    Konrad Kleine (32):
          Initial attempt to do snapshot-build
          Don't enter dir twice
          Adopt D103156
          Update D103156.diff
          D103156 was merged upstream so no need to apply it manually here
          Disable checks when building snapshots
          Make download path for snapshot sources-easily adjustable
          Cleanup and use llvm_snapshot_changelog_entry macro
          Use llvm_snapshot_version_suffix
          Use new llvm-snapshot-builder macro
          Enable build condition snapshot_build by default
          Add .copr/Makefile
          Fix order of package installs
          Remove need for rpkg
          Apply workaround for enabling the llvm-snapshot-builder repo
          fix typo
          Fix paths to download sources to
          Move rpm to outdir
          Move source RPMs not binary ones
          Temporarily enable debug output
          Alternative approache to verbose output
          Add llvm-release-<YYYYMMDD>.txt and llvm-git-revision-<YYYYMMDD>.txt to the list of sources
          Re-enable verbose output
          Use llvm_snapshot_extra_source_tags macro
          Merge remote-tracking branch 'upstream/main' into upstream-snapshot
          Merge remote-tracking branch 'upstream/rawhide' into upstream-snapshot
          README.txt was renamed to README.rst upstream
          Merge remote-tracking branch 'origin/rawhide' into upstream-snapshot
          Merge remote-tracking branch 'origin/rawhide' into upstream-snapshot
          Rem. @fedora-llvm-team/llvm-snapshot-builder repo
          Fixup for #34: removal of obsolete repo.
          Fixup for PR #35