gsettings: Wait for all configuration updates
gsettings: Wait for all configuration updates

If we haven't polled the pxgsettings helper for a while, there might
be more proxy configuration updates in the pipe than will fit in a
single read() call.

Signed-off-by: Simon McVittie <0e1aea601907c1a85c2dc96e5ea37e23c58d2e9b@debian.org>

libproxy/libproxy,libproxy/libproxy,horar/libproxy,horar/libproxy,libproxy/libproxy,horar/libproxy,horar/libproxy,horar/libproxy,horar/libproxy,libproxy/libproxy,libproxy/libproxy,libproxy/libproxy,horar/libproxy,libproxy/libproxy