Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add a declaration that malloc() returns a pointer, not an int. Otherwise
this segfaults on ia64. (Cannot cast an int to a pointer).
The rest of the code does it this way rather than use system includes....

Since our inetd wrapped now, treat all its services as tcpd-prefixed
for tcpdchk

This commit was generated by cvs2svn to compensate for changes in r44743,
which included commits to RCS files with non-trunk default branches.

Clean import of TCP-wrappers by Wietse Venema.
Rest of build to follow.