Remove last references to __HAVE_SIGINFO

RPC kqueue project done.

Fixing showmount was easier than I thought..

Add entry about showmount IPv6 support.

more nits.

Remove trailing white space.

More simple projects.

blurb for libpthread.

Fix typo.

Add TODO.nits file intended to document small
/*XXX this is straightforward to fix but I have no time right now */
tasks so we don't lose track of them.

Format and purpose are documented at the top of the file.

Discussed with Christos and others