AppVeyor build failing due to array library test failures

[dpk]

There’s something funky going on with the AppVeyor build where a bunch of the SRFI 231/179 tests are failing, but apparently only since #1008 was merged. Those tests were seemingly, passing before I rebased that PR onto the branch with the repl-print-exception generic function installed …

[ashinn]

Not just arrays, various tests are failing with errors like "substring not defined", looks like the build is corrupt. This only happens for cmake which I'm not too familiar with. I'll take a look.