buildroot

qpid-proton: remove now-redundant ccache handling patch

Although this patch is still relevant for upstream, we don't need it
anymore in buildoort because we no longer have _ARG1.

Note that it would be relevant again if we would add host-qpid-proton.
However, the 0.10 release already has the fix.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Reviewed-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>