Add --disable-gems if CC is icc.
Add --disable-gems if CC is icc.

Otherwise spec fails because libimf.so is not found.

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