fetchpatch: Sort/filter patch by filenames.

This not only sorts the patch but also filters out duplicate files,
currently all uses of fetchpatch lead to the same hashes so they're
already sorted.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Merge pull request #1 from aszlig/fetchpatch-sort

fetchpatch: Sort/filter patch by filenames.