The postPatch attribute is already in the function argument but is
unused elsewhere in the code, so setting postPatch with buildRebar3 is
going to end up in a no-op.
This now allows to use postPatch within buildRebar3 by simply appending
to the existing postPatch hook that removes the rebar and rebar3
escripts.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Cc: @ericbmerritt
86d1953ed4