7d861e1263
* Add `bpf-framework` feature gate with 'auto', 'true' and 'false' choices * Add libbpf [0] dependency * Search for clang llvm-strip and bpftool binaries in compile time to generate bpf skeleton. For libbpf [0], make 0.2.0 [1] the minimum required version. If libbpf is satisfied, set HAVE_LIBBPF config option to 1. If `bpf-framework` feature gate is set to 'auto', means that whether bpf feature is enabled or now is defined by the presence of all of libbpf, clang, llvm and bpftool in build environment. With 'auto' all dependencies are optional. If the gate is set to `true`, make all of the libbpf, clang and llvm dependencies mandatory. If it's set to `false`, set `BPF_FRAMEWORK` to false and make libbpf dependency optional. libbpf dependency is dynamic followed by the common pattern in systemd. meson, bpf: add build rule for socket_bind program
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