Log Message:
Some makedepend's object if a referenced header file is a dangling
symlink, so create the actual release.h file at the includes stage as
the depends stage is too late (server/os is before lib/audio).
Fixes PR pkg/32098 from Gilles Dauphin.

Also fix installation of nasd.conf manual page on systems where imake
doesn't have an InstallGenManPage rule (ie. solaris with openwin)