HomeFreeBSD

Add deprecation notices for gdb and kgdb.

Description

Add deprecation notices for gdb and kgdb.

Even though gdb and kgdb may not be removed for 12.0 on some architectures,
the notice is unconditional as these tools will likely be removed at some
point in the future when adequate replacements are available (gdb in ports
or lldb in base).

Reviewed by: emaste
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D11477

Details