choose_classes_menu was declared extern. The only caller presently
was calling it was optfn_pickup_types() in options.c.
It could have had the extern declaration from include/extern.h and
declare it as static within options.c, if that was the only use
anticipated. Also, if the one existing caller were all there would
ever be, the argument passed to it that was the subject of pr #1146
could have just been removed along with the switch.
Checking the comments above the function, however, it was clearly
designed as a general-purpose function that could be called from
anywhere for the functionality desired, even though there's presently
just the one caller, passing just the one variation of the category
argument.
Relocate the general-purpose function over to src/windows.c, where
several interface-related / menu-related general-purpose functions
already reside.
options.c has gotten *huge* and this is a fitting opportunity to
reduce its size a little.
fa4a47d8ff