* [libbpf] initial integration
* [libbpf] link against zlib statically
it somehow helps to get around https://github.com/google/oss-fuzz/issues/6524
* [libbpf] trim headers
* [libbpf] more sanitizers
* [libbpf] show the commit libelf is built from
to make it easier to roll back to the last known working version
should something go wrong
* [libbpf] pin libelf to a particular commit
to avoid running into unpredictable build failures that
can't be controlled by the libbpf project itself. In the future
libelf should probably be built using the latest stable release
at https://sourceware.org/elfutils/ftp/elfutils-latest.tar.bz2
* [libbpf] add more comment
to hoppefully make it easier to make sense of the build script
in the foreseeable future
* [libbpf] add support for "local" mode without docker
to make it easier to build the fuzz target locally:
```
cd projects/libbpf
git clone https://github.com/libbpf/libbpf
./build.sh
unzip -d CORPUS ./out/bpf-object-fuzzer_seed_corpus.zip
./out/bpf-object-fuzzer CORPUS/
```
* [libbpf] more comments
* [libbpf] add the maintainer's email address
* [libbpf] more comments
* [libbpf] install libz explicitly
* [libbpf] build 4 times a day
It should help to prevent OSS-Fuzz from reporting issues that
have already been fixed
Evgeny Vereshchagin