install_prereq: removed some out-of-date comments

git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@383747 f38db490-d61c-443f-a65b-d21fe96a405b
Fix missing ' ' around '='


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@383753 f38db490-d61c-443f-a65b-d21fe96a405b