abuild: add amove func to move from $pkgdir to $subpkgdir

moving files and directories from $pkgdir to $subpkgdir is a common
pattern, so make a helper function for this.

usage: amove FILESPEC...

FILESPEC is a list of files or patterns/globs that will be exanded by
the shell.

amove will clean up empty directories after moving the files/dirs.

Example usage:

  amove 'usr/lib/lib*.a'
  amove 'etc/*.d' # moves both etc/conf.d and etc/init.d
  amove 'lib/*.so' 'usr/lib/*.so'

  cd "$pkgdir"
  find usr -name '*.h' | xargs amove

This is based on the work of Chloe Kudryavtsev:
https://github.com/alpinelinux/abuild/pull/92

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