Fix [2061292] by disabling redundant draconian mutations: red draconians

shouldn't get the "Breathe Flames" mutation, and green draconians shouldn't get the "Spit Poison" mutation, since their breathing poison supersedes that.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6857 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on August 23, 2008
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