winewrapper: Remove explicit call to wineprefixcreate.

Now that wineprefixcreate detects the build tree automatically, the
standard behavior of starting it from ntdll should work fine.

tools/winewrapper

@@ -97,13 +97,6 @@ then
     . $topdir/.winewrapper
 fi
 
-# create prefix directory if needed
-
-if [ -z "$WINEPREFIX" -a ! -d "$HOME/.wine" ]
-then
-    "$topdir/tools/wineprefixcreate" --use-wine-tree "$topdir"
-fi
-
 # and run the application
 
 case "$0" in