mbrola: Fix compilation on Darwin

It looks like mbrola hasn't done a release in 6 years or so. In that
time, they have a few fixes for compiling on Darwin. However, picking up
those changes would require us to start packaging the latest git which
is unreleased. I tried grabbing the relevant patches, but they don't
seem to apply cleanly. So, instead, I just made some tweaks to the files
to get things to compile using substituteInPlace.

The first thing we patch is that the Makefile requests the "O6"
optimization level - which does not exist in gcc or clang - but is an
error in clang.

The second thing is that the project attempts to re-define the "swab"
function from unistd.h. Which maybe was necessary in the past, but now
is an error.

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