[Bug tapsets/18711] Pass 4 failure on RHEL7 for examples netfilter_summary and netfilter_drop

["mcermak at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18711

--- Comment #3 from Martin Cermak <mcermak at redhat dot com> ---
Created attachment 8460
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8460&action=edit
proposed patch

This is how nf_hookfn looks like in kernel-3.10.0-300.el7:

=======
typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops,
                               struct sk_buff *skb,
                               const struct net_device *in,
                               const struct net_device *out,
#ifndef __GENKSYMS__
                               const struct nf_hook_state *state
#else
                               int (*okfn)(struct sk_buff *)
#endif
                               );
=======

I don't see the __GENKSYMS__ macro in vanilla kernel sources. In the
distribution kernel-3.10.0-300.el7.x86_64 it is defined in
scripts/Makefile.build as follows:

=======
cmd_gensymtypes =                                                           \
    $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
    $(GENKSYMS) $(if $(1), -T $(2))                                         \
     $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
     $(if $(KBUILD_PRESERVE),-p)                                            \
     -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
=======

Branch where __GENKSYMS__ is defined is already covered by autoconf-netfilter.c
aka STAPCONF_NETFILTER_V313. This patch basically adds support for the other
branch, where __GENKSYMS__ is not defined. This solution shouldn't bring any
regression. It tests fine across rhel[567] all supported arches. It namely also
tests fine on arm64 with kernel-4.2.0-0.rc3.14.el7.aarch64.

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