appveyor.yml: make sure MJIT is tested on AppVeyor

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64222 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

appveyor.yml

@@ -49,7 +49,7 @@ test_script:
   - set /a JOBS=%NUMBER_OF_PROCESSORS%
   - nmake -l "TESTOPTS=-v -q" btest
   - nmake -l "TESTOPTS=-v -q" test-basic
-  - nmake -l "TESTOPTS=-q -j%JOBS%" test-all
+  - nmake -l "TESTOPTS=-q -j%JOBS%" test-all RUBY_FORCE_TEST_JIT=1
   - nmake -l test-spec
 matrix:
   fast_finish: true