PocketSNES for GCW0/RG350 v2020.10.24

• Add support for the PocketGo2 v2 menu button by @nl255
• Use -fno-unroll-loops. This brings some performance improvements, like Kirby Super Star intro runs at 60FPS instead of dropping some frames

Same profile.zip as the last version, since the only change code-wise was the addition of menu button. So this version compiles with some warnings, but they should be inoffensive (i.e.: they don't affect performance).