Consolidate "Summon Dragon" into summon_general_creature() as well.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5523 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on June 6, 2008
5T56ZXHVBN4LBEOHZPRV65UNS2HJ7RX6AMU7GHNAJRAQ7QKECP5AC
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