Update to the latest upstream release to include recent improvements and
bugfixes. Update copyright, fix typo in PKG_NAME, and remove unneeded use
of MAKE_VARS definition in Makefile. Drop 001-cflags.patch and simplify
002-includes.patch after refreshing. Also simplify LTO/DCE build flags.
Link: https://github.com/libbpf/bpftool/releases/tag/v7.4.0
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
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