d/rules: If cross-compiling, use cross g-ir-scanner (see #1060838)

debian/control

@@ -20,6 +20,7 @@ Build-Depends: adwaita-icon-theme-full <!nocheck>,
                gir1.2-xlib-2.0-dev | libgirepository1.0-dev,
                gnome-pkg-tools (>= 0.11),
                gobject-introspection (>= 1.41.3),
+               gobject-introspection (>= 1.78.1-9~) <cross>,
                gsettings-desktop-schemas <!nocheck>,
                libatk-bridge2.0-dev (>= 2.15.1),
                libatk1.0-dev (>= 2.35.1),

debian/rules

@@ -88,6 +88,10 @@ configure_flags_deb = \
 	-Dprint_backends=cups,file \
 	$(NULL)
 
+ifneq ($(DEB_BUILD_ARCH),$(DEB_HOST_ARCH))
+configure_flags_deb += --cross-file=$(DEB_HOST_GNU_TYPE)-gobject-introspection.ini
+endif
+
 ifeq (,$(filter stage1,$(DEB_BUILD_PROFILES)))
 configure_flags_deb += -Dcolord=yes
 else