Missing macOS support: xbstrap requires GNU patch

[pitust]

So patch --merge doesn't work on macOS, and so xbstrap breaks.

[avdgrinten]

Is there an alternative that works?

[ArsenArsen]

Why are we even using patch --merge?

If there's a solid reason, I think it's reasonable to decide whether we're targetting GNU coreutils or POSIX patch, they do differ, since POSIX patch differs from older patch implementations, too.

[pitust]

getting patch from homebrew solved the issue BTW. --merge is not part of the POSIX spec

[ArsenArsen]

Is there need for --merge, considering these are automatic patches?