gbitmap_is_palette_black_and_white is only available on BASALT

[nothingmn]

No description provided.

[Meiguro]

Hmm, this appears to break builds on aplite since the function is unconditionally used in aplite.

In fact, aplite always returns GBitmapFormat1Bit for gbitmap_get_format, so gbitmap_is_palette_black_and_white is always safely false in aplite, since aplite gbitmaps, while they are black and white images, do not have palettes to consider as black and white.

I agree that it is a little odd that aplite seemingly has palette modification code, but it is compiled away as deadcode since it is guarded. I may consider refactoring it if it is too confusing.