[PATCH 1/7] PR gdb/15224 should "set history save on" by default

[Pedro Alves]

Please do this in the command's set handler rather than
hacking in the the set/show machinery.

Please give each patch a distinct subject next time.

(Including a self-contained description of what's wrong,
and what and how the patch fixes it in the submission
is also useful for both review, and future archaeology.)

Thanks,
-- 
Pedro Alves