Hxcpp needs the PLATFORM define for older ndks that require the gcc toolchain. We initially removed it since Lime potentially was going to have a minimum requirement of android sdk 28 due to openal soft version 1.20.1, however, this was solved by upgrading to 1.21.1 which presented no further conflicts with sdk 21.
To simply things, we just provide both defines for now.
Co-authored-by: player-03 <player3.14@gmail.com>