For god gift monsters have _place_monster_aux() set the monster's god field

in addition to its MF_GOD_GIFT flag.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8061 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on December 31, 2008
NDWM3E3WYGWGCSNWJAPL6EC73QQ3ZXR2SEOW4L3N4UAT4E7XXUZAC
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