Add two last speed handling fixes: give skeletons the same speed as

zombies, so they don't get zero (this will be overridden when they're created anyway), and give abominations and beasts speeds of -1 (this will be overridden in _mons_real_base_speed() when they're created anyway). Note that the "x" screen still doesn't display the right speeds for the latter.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9461 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on March 13, 2009
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