Merge branch 'jk/repack-silence-auto-bitmap-warning'

Squelch unneeded and misleading warnings from "repack" when the command attempts to generate pack bitmaps without explicitly asked for by the user. * jk/repack-silence-auto-bitmap-warning: repack: simplify handling of auto-bitmaps and .keep files repack: silence warnings when auto-enabled bitmaps cannot be built t7700: clean up .keep file in bitmap-writing test