Specify MRUBY_TARGET in CI configuration YAML.

.travis.yml

@@ -8,7 +8,7 @@ jobs:
       - export PATH="/usr/local/opt/bison/bin:$PATH"
 
 env:
-  - MRUBY_CONFIG=travis_config.rb
+  - MRUBY_TARGET=travis
 
 script:
   - rake gensym && rake -m && rake test

appveyor.yml

@@ -39,7 +39,8 @@ init:
   - ruby --version
 
 build_script:
-  - set MRUBY_CONFIG=appveyor_config.rb
+  - set YACC=.\win_flex_bison\win_bison.exe
+  - set MRUBY_TARGET=appveyor
   - rake gensym
   - rake -m -j4
   - rake -E STDOUT.sync=true test