Bump libproxy requirement

[Nicolas Dufresne <nicolas dufresne collabora co uk>]

Hi all,

as many may have noticed, GLib 2.26 gains proxy support with configuration being provided by libproxy (through plugin in glib-networking ). The problem is that current recommended version of libproxy (0.4.0 on the wiki and 0.4.3 in jhbuild) does not work when used through a plugin, see libproxy issue 133.  This issue has been fixed in version 0.4.5, which is the version I would like to bump to.

Best regards,
Nicolas

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