Add support for patching source packages.
Sometimes there's a need to patch upstream source. While this can be scripted using prebuild commands, it's very verbose and unstructured, so add dedicated patching support. Details: To patch source, specific build's metadata line should include: patch=patch1.patch;patch2.patch;... Patches are separated with ';', at least one patch should be specified. They are applied in the order given. Patches are looked up in metadata/<package>/ directory. Different builds obviously may reference the same patch(es).
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