pkg-config support for portmidi

[Adrian Knoth]

Hi portmidi developers!

I recently decided to use portmidi as the foundation for one of my
projects <https://plus.google.com/u/1/+adiknoth/posts/PddEdbm7PNj>.

Since I would greatly benefit from a pkg-config file, I thought let's
see if it's included upstream. Turned out it isn't, but somebody
provided patches two years ago:

   https://www.mail-archive.com/media_api@create.ucsb.edu/msg00500.html

Could we get this into the official repos, so that we downstream folks
(I also represent the Debian multimedia team) can ship it?


Thanks in advance

-- 
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