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

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

bring in the necessary changes to make gdbserver compile and work (at
least on i386)... fbsd-* changes started out as s/linux/fbsd/g and then
additional changes to handle different ptrace defines among other things..
(use vfork to eliminate a race for progress group creation)

reg-i386.c is generated by regdat.sh..

This commit was generated by cvs2svn to compensate for changes in r157571,
which included commits to RCS files with non-trunk default branches.

import gdbserver Linux files renamed to fbsd... I have made gdbserver
work w/ minor modifications to these files, so keep the history...

These are stock files from GDB 6.1.1 w/ only the filename s/linux/fbsd/g