So, looking at debian/rules, it seems there is code intending for these symlinks to be created, but it isn't working:
sed -i 's,/usr/lib/,/usr/lib32/,g' debian/ia32-libs/usr/lib32/gtk-2.0/2.10.0/*.d/*
dh_link -pia32-libs /usr/lib32/gtk-2.0/2.10.0 /usr/lib/gtk-2.0/2.10.0/i486-pc-linux-gnu
So, looking at debian/rules, it seems there is code intending for these symlinks to be created, but it isn't working:
sed -i 's,/usr/ lib/,/usr/ lib32/, g' debian/ ia32-libs/ usr/lib32/ gtk-2.0/ 2.10.0/ *.d/*
dh_link -pia32-libs /usr/lib32/ gtk-2.0/ 2.10.0 /usr/lib/ gtk-2.0/ 2.10.0/ i486-pc- linux-gnu