Fix rtmidi-config.in (test uses = for string comparison, not ==)
Fix rtmidi-config.in (test uses = for string comparison, not ==)

OpenMusicKontrollers/chimaerad,OpenMusicKontrollers/chimaerad,OpenMusicKontrollers/chimaerad,OpenMusicKontrollers/chimaerad,OpenMusicKontrollers/chimaerad,OpenMusicKontrollers/chimaerad