Although libsoup did use to support direct usage of libproxy, it hasn't
done so for some time. Worse, if libsoup depends on libproxy then it
is impossible to build libproxy against webkit since webkit itself
depends on libsoup in some configurations. Fix this by removing the
extraneous entry from DEPENDS.
Signed-off-by: Phil Blundell <pb@pbcl.net> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>