[Ohrrpgce] SVN: teeemcee/10463 Add FAIL_IF and ERROR_IF macros, and use them to improve surface_export_

[subversion at HamsterRepublic.com]

teeemcee
2018-07-25 08:36:32 -0700 (Wed, 25 Jul 2018)
254
Add FAIL_IF and ERROR_IF macros, and use them to improve surface_export_gif error checking

We have way too many cases of a simple 'debug' printed on an error which
indicates a serious engine bug. Might start using ERROR_IF heavily for that
case instead.
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U   wip/allmodex.bas
U   wip/util.bi