Basic SIGWINCH handling for Unix. Still needs to handle some cases (resizing

the term in the level-map doesn't work right, for instance).

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1593 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on June 17, 2007
W6IY6LF3MREPXC23AAKA2BJNUCJYCSOWY55DIWJWFLUEE2Y3LGNQC
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