zstd: fix compilation with Solaris Studio Without these changes, Solaris Studio (12.4) gives us "syntax error: empty declaration" on these two lines.

cmdutil: turn forward of checkunresolved into a deprecation warning As with dirstateguard, I really doubt anyone outside core was using this, as my grep over the repositories I keep locally suggests nobody was using this. If others are comfortable with it, let's drop the forward entirely.

localrepo: refer to checkunresolved by its new name