devel/gdb: Upgrade to 14.1

• Notable upstream fixes for FreeBSD include better support for multiprocessing as well as support for AVX and other extended registers in core dumps on newer AMD CPUs.

• Use all-gdb as the build target to reduce build time.

• sim can no longer be excluded during the tarball as a couple of source files in GDB now use headers from sim/ unconditionally. Instead, use --disable-sim to skip building the simulators.

Reviewed by: pizzamig
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D43053