Remove the Bash launcher for JRuby on Windows, always use jruby.exe

* The Bash launcher causes warnings, see
  ruby/setup-ruby#13 (comment)

Author: eregon

.github/workflows/build.yml

@@ -65,7 +65,7 @@ jobs:
         asset_content_type: application/gzip
 
   buildJRubyWindows:
-    if: false
+    if: true
     strategy:
       fail-fast: false
       matrix:
@@ -92,6 +92,8 @@ jobs:
         mkdir ~/.rubies
         tar xf jruby-dist-${{ matrix.jruby-version }}-bin.tar.gz -C ~/.rubies
         cd ~/.rubies/${{ matrix.ruby }}/bin
+        # Remove the Bash launcher, always use jruby.exe
+        rm jruby
         echo -en "@ECHO OFF\r\n@\"%~dp0jruby.exe\" %*\r\n" > ruby.bat
     - name: Install Bundler if needed
       shell: bash
@@ -187,7 +189,7 @@ jobs:
         asset_content_type: application/gzip
 
   buildRubinius:
-    if: true
+    if: false
     strategy:
       fail-fast: false
       matrix: