Add --disable-gems to support icc
Add --disable-gems to support icc

icc's stringio.so requires ENV['LD_LIBRARY_PATH'] which is loaded with gems.
I avoid it by simply not to load rubygems.
http://rubyci.s3.amazonaws.com/icc-x64/ruby-trunk/log/20160117T110002Z.fail.html.gz

nobu/rubyspec,wied03/rubyspec,ruby/rubyspec,kachick/rubyspec,sgarciac/spec,ruby/spec,ruby/spec,nobu/rubyspec,eregon/rubyspec,sgarciac/spec,ruby/rubyspec,eregon/rubyspec,wied03/rubyspec,wied03/rubyspec,ruby/spec,eregon/rubyspec,nobu/rubyspec,kachick/rubyspec,sgarciac/spec,kachick/rubyspec