websockets: fix 32-bit build
websockets: fix 32-bit build

https://bugzilla.gnome.org/show_bug.cgi?id=745509

fanc999/libsoup,fanc999/libsoup,jwendell/libsoup,fanc999/libsoup,jwendell/libsoup,jwendell/libsoup,fanc999/libsoup,fanc999/libsoup,jwendell/libsoup,jwendell/libsoup