netfilter: gre: Use consistent GRE_* macros instead of ones defined by netfilter.
There are already some GRE_* macros in kernel, so it is unnecessary to define these macros. And remove some useless macros Signed-off-by: NGao Feng <fgao@ikuai8.com> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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