depend: trim spurious leading tab These vars are replaced with a list of remove commands that are joined with a \n and each line always has a leading \t inserted. That means the literal tab here before the var leads to 2 tabs included in the output. While not functionally a problem, it can be a bit confusing when reading the output as it implies something is amiss. Trimming the tab also aligns with the other .am files which don't include it. * lib/am/depend.am: Delete tab before %DISTRMS%.