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

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

Update to GDB 6.1.1. These files are identical to the vendor branch.

Our FreeBSD custom changes are OBE. Return to using the stock vendor sources.

Remove the filename_completion_function() extern that conflicts with the
latest version of this fuction in Readline 4.2

Reduce default timeout on remote serial debugging sessions from 20
seconds to 1 second. This fixes a problem where gdb would appear to
hang on flaky serial connections. There's a theoretical problem that
the relatively short timeout could cause problems on slow links, but
you can override the default value with the 'set remotetimeout'
command.

Approved-by: dfr

This commit was generated by cvs2svn to compensate for changes in r46283,
which included commits to RCS files with non-trunk default branches.

Virgin import of gdb-4.18

Import GDB in its full glory (all 25mb). We'll put it on a diet once it's
fully registered.

(This is the second try, the first import ignored .info files but not .info-*
files, for some reason. I'm going to make this consistent.)

Reviewed by: core
Approved for: 2.2