Mac OS X: add proper build target for USE_TILE builds

We don't need the wrapper script (see 'crawl-ref/source/mac/crawl') in USE_TILE builds, because the terminal prints no output anyway, and the compiled binary from Crawl-tiles-cmd is Mac OS X native already. So instead of building a command line version and wrapping it, use a proper target which builds an app bundle.

Also drops the Crawl-tiles-cmd target on Xcode.

Signed-off-by: Steven Noonan <steven@uplinklabs.net> Signed-off-by: Darshan Shaligram <dshaligram@users.sourceforge.net>

Created by  Steven Noonan  on September 24, 2009
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