
Following recent changes to use libroot_build on Haiku also, it is now actually impossible to build Haiku components on non-Haiku platforms (BeOS R5, Dan0, BONE, Zeta), so we can remove any logic related to this. This is only the first part; still to be removed are: * SetSubDirSupportedPlatformsBeOSCompatible * HOST_PLATFORM_BEOS_COMPATIBLE * TARGET_PLATFORM_BEOS_COMPATIBLE