Build failure with new libc (missing references to functions)

[ParzivalWolfram]

Something has broken in new-ish libc that causes most distros' arm-none-eabi toolchains to fail to compile the loader due to missing functions. More specifically, the following functions fail due to undefined references in Arch's arm-none-eabi-newlib package:

• _close
• _lseek
• _read
• _write
• _sbrk
• _exit
• _fstat
• _isatty
• _kill
• _getpid

[ParzivalWolfram]

This would be partially solved by building both this and arm9linuxfw inside Buildroot, using the toolchain it generates. This isn't necessarily a good idea, but it would work.