Don't assert in CrawlVector::set_max_size() if called more than once on

the same vector as long as the new max size is the same as the old one.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5471 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on June 4, 2008
CRQZPF2BLLIDXCUOBLYDBDA5TC26EE7R7DTO76SMCQWDINVEW5SAC
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