avoid false detection of redhat systems by moving them to the end of detection, fix #2402
jruby-1.7.9, thank you @enebo
add ssl_no_ec2m for 1.9.2 on redhat/centos, update #2321
remove the brew link from rvm/bin, it is autodetected in autolibs, fix #2407
show last 15 lines of log on error, fix #2404