fluidsynth 2.4.1

• Enable libsndfile to use filename with non-ASCII characters on Windows (#1416, thanks to @pedrolcl and @stardusteyes)
• Fix a few commandline encoding related issues on Windows (#1388, #1421, thanks to @pedrolcl)
• Fix build errors on Windows (#1419, #1422, thanks to @carlo-bramini)
• Fix clicks and pops caused when changing parameters of the lowpass filter (#1415, #1417, #1424)
• Minor adjustment to AWE32 NRPN behavior (#1430)