libffmpeg.dylib seems to be missing in OSX deployment

[auragamedev]

Version Information:

• RPGMPacker Version: 1.2.1
• RPG Maker Version: MZ

There seems to be a hardcoded chromium version number, but RPGM changed the nwjs versions and with it also the chromium versions so the libffmpeg.dylib file seems to be incorrectly ignored.

https://github.com/erri120/rpgmpacker/blob/ffcb27912abb6e2d57d55a5f844a529754a58516/RPGMPackerLib/src/utility.cpp

Upper picture is export from RPGMaker, lower one using RPGMPacker.

Log:
https://gist.github.com/auragamedev/91a22845e1c906f57d3d12574745bf24

[erri120]

Fixed in #44