It receives the malloc() result, and we do not want the malloc() call
to be optimized out, which is allowed for hosted compiler. Use dummy
for actual write though.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
This is being addressed as part of a side-patch I'm working on that builds
all the things with WARNS=6, instead of relying on it being supplied in just
shallow parts of the build with higher-level Makefile.inc.
Provide a prototype for mod_main and annotate the thread function argument
as unused.
MFC after: 1 week