crashinfo: remove gdb 6.1 leftovers

[emaste]

Summary

We no longer provide gdb 6.1 in /usr/libexec, so don't check for it in crashinfo.

[emaste]

usr.sbin/crashinfo/crashinfo.sh

46–47

I left this as is for now, as we may want to check for multiple gdbs in the future again. We could just remove this completely.

72

this is a workaround for obsolete gdb and presumably will never be needed again

80

With lldb main we can do lldb --batch -o 'p version' /boot/kernel/kernel -c /var/crash/vmcore.0

lldb prints all 256 chars of version though, (char[256]) $0 = "FreeBSD 14.0-CURRENT #4....\n\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0..."

Aside, I wonder if it would be possible to extend lldb's emulator?

(lldb) expr printf("%s", version)
error: expression failed to parse:
error: Can't evaluate the expression without a running target due to: Interpreter doesn't handle one of the expression's opcodes

[emaste]

clean up some more

[jhb]

usr.sbin/crashinfo/crashinfo.sh

46–47

We can probably remove it completely. However, we might need a different set of abstractions in the future for lldb vs gdb (e.g. a helper function to fetch the version string).

[emaste]

usr.sbin/crashinfo/crashinfo.sh

46–47

Yes, whatever we do to support lldb will probably be quite different.