
By default, all targets support the "haiku" platform, and we no longer support building for BeOS, Dan0, Zeta, or other BeOS-compatible targets, so this is no longer needed. Also remove all references to the non-Haiku compatible platforms, and change all BEOS_COMPATIBLE checks to HAIKU_COMPATIBLE. Removal of all SetSubDirSupportedPlatformsBeOSCompatible invocations will be in the next commit.