Build with libcurl http backend instead of libsoup2.4

This avoids library conflicts during the transition to GNOME 43, in
which core apps and libraries have switched to libsoup3, which conflicts
with libsoup2.4.

We still build-depend on libsoup2.4, because it's used in the test suite
and installed-tests.

Closes: #1016589

debian/control

@@ -29,6 +29,7 @@ Build-Depends:
  libavahi-client-dev (>= 0.6.31),
  libavahi-glib-dev (>= 0.6.31),
  libcap-dev,
+ libcurl4-gnutls-dev | libcurl-dev,
  libfuse3-dev,
  libgirepository1.0-dev,
  libglib2.0-dev (>= 2.66.0),

debian/rules

@@ -13,6 +13,7 @@ override_dh_autoreconf:
 configure_options = \
 	--enable-installed-tests \
 	--with-avahi \
+	--with-curl \
 	--with-dracut \
 	--with-grub2 \
 	--with-grub2-mkconfig-path=/usr/sbin/grub-mkconfig \