adts: use SAFE_FREE
config: add CONFIG_FINAL; use it in
compression,vfs_optimizer,scriptablecomplex
lib: add discussion of unreachable code avoidance; revise UNREACHABLE
and add NODEFAULT
ogl_tex, tex_dds: remove some unnecessary UNREACHABLE
sysdep: move compiler-specific implementation of UNREACHABLE here.
use NODEFAULT in snd, wdbg, wposix, wsdl
This was SVN commit r3739.