Only load ASDF if the Cmucl providers failed

If the cmucl providers succeed, don't load asdf so we don't
unnecessarily pollute the image if asdf isn't needed.  If the cmucl
providers fail, then load asdf so we can use asdf to load the other
contribs or other asdf packages that might be available.
10 jobs for issue-113-prefer-cmucl-modules in 20 minutes and 12 seconds (queued for 8 seconds)
latest
Status Name Job ID Coverage
  Install
passed linux:install #19424
linux

00:00:41

passed osx:install #19425
osx

00:01:01

 
  Build
passed linux:build #19426
linux

00:05:19

passed osx:build #19427
osx

00:09:28

 
  Test
passed linux:test #19428
linux

00:00:26

passed osx:test #19429
osx

00:01:03

 
  Ansi Test
passed linux:ansi-test #19430
linux

00:02:17

passed osx:ansi-test #19431
osx

00:03:56

 
  Benchmark
passed linux:benchmark #19432
linux

00:02:55

passed osx:benchmark #19433
osx

00:04:33