Make omnibus-test.sh use appropriate toolchain
Make omnibus-test.sh use appropriate toolchain

Signed-off-by: Jeremiah Snapp <a9df78b4b5c00745f26b0821b2cc57336a474862@chef.io>

mattray/chef,MsysTechnologiesllc/chef,chef/chef,nvwls/chef,nvwls/chef,tas50/chef-1,higanworks/chef,higanworks/chef,nvwls/chef,chef/chef,gene1wood/chef,higanworks/chef,gene1wood/chef,MsysTechnologiesllc/chef,mattray/chef,mwrock/chef,mwrock/chef,nvwls/chef,jaymzh/chef,tas50/chef-1,mattray/chef,MsysTechnologiesllc/chef,MsysTechnologiesllc/chef,jaymzh/chef,gene1wood/chef,mwrock/chef,mwrock/chef,chef/chef,tas50/chef-1,higanworks/chef,jaymzh/chef,mattray/chef,jaymzh/chef,chef/chef,gene1wood/chef,mattray/chef,higanworks/chef,nvwls/chef,nvwls/chef,tas50/chef-1