[rubygems/rubygems] installer.rb - fix #windows_stub_script
use ruby_exe in heredocs instead of ruby.exe
https://github.com/rubygems/rubygems/commit/9f1b7d6590
[rubygems/rubygems] installer.rb - fix #windows_stub_script
use ruby_exe in heredocs instead of ruby.exe
https://github.com/rubygems/rubygems/commit/9f1b7d6590