Motivation / Problem

I was looking through the code and found an remnant of the past.

Description

Back in the day Squirrel could be compiled either 32bit or 64bit. _SQ64 indicate which of the two. This of course was problematic, as we had AIs that did work on a 64bit system, but failed on a 32bit. So yeah .. since 39e90ec Squirrel is always in 64bit mode.

Just ... some people found out that _SQ64 indicate if the system was 64bit or not, and started to use that in a few other places in the code too. And so now we are left with a codebase where the reference to Squirrel is lost in the meaning of the define (read: it is not used anywhere in Squirrel, yet carries the name).

So, lets rename the variable in to what it means, so the other usages feel a bit more legit :) We are now _SQ64 free! \o/

Limitations

Checklist for review

Some things are not automated, and forgotten often. This list is a reminder for the reviewers.

• The bug fix is important enough to be backported? (label: 'backport requested')
• This PR affects the save game format? (label 'savegame upgrade')
• This PR affects the GS/AI API? (label 'needs review: Script API')
  • ai_changelog.hpp, gs_changelog.hpp need updating.
  • The compatibility wrappers (compat_*.nut) need updating.
• This PR affects the NewGRF API? (label 'needs review: NewGRF')
  • newgrf_debug_data.h may need updating.
  • PR must be added to API tracker