[bug#38217] [PATCH] gnu: rtmidi: Update to 4.0.0.

[Pierre Langlois]

Hello Guix!

Here's an update for the rtmidi package. I've had to fix the
powertabeditor package to be able to find the RtMidi.h header which has
now moved into a subdirectory. It looks like the issue is fixed upstream
in the build system but no release have been made yet so I've added a
TODO to remove the hack later.

WDYT?

Thanks,
Pierre

0001-gnu-rtmidi-Update-to-4.0.0.patch
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