Removed pointless *level_builder_function from branches[].

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1277 c06c8d41-db1a-0410-9941-cceddc491573

Created by  haranp  on April 10, 2007
KKROXTUPBNEXXEUUDJNADATK3BCQPSQWFZ6L4VTKBPTYXJLYUHDQC
Change contents