Log Message:
Quote CFLAGS when passing them to MAKEFLAGS; if they contain spaces, build
will fail. Also fix a "typo" in the manpage (Awk->Nawk). Patch \ 
provided by
Christopher Richards in PR pkg/19344.

While I'm here, move manpage generation to the post-build target (where it
should be) and use INSTALL_MAN to install it (instead of generating it in
place).