.travis.yml: tweek after-update

* .travis.yml (before_script): get rid of making miniruby at
  after-update.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58544 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

.travis.yml

@@ -44,7 +44,7 @@ before_script:
   - "cp -pr config.status .ext/include config_2nd"
   - "diff -ru config_1st config_2nd"
   - "make touch-unicode-files"
-  - "make after-update BASERUBY=ruby UNICODE_FILES=."
+  - "make after-update BASERUBY=ruby BOOTSTRAPRUBY='$(BASERUBY)' MINIRUBY='$(BASERUBY)' UNICODE_FILES=. PREP= CC=false"
   - "make -s $JOBS"
   - "make update-rubyspec"
   - "requests="