setup-build-env: Install pkg-config for bpf selftests traffic monitoring #172
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Install pkg-config in setup-build-env explicitly so that we can build bpf selftests with traffic monitor without depending on the runner. Currently, s390 runner image does not include pkg-config required by bpf selftests traffic monitor. During compile time, the makefile uses pkg-config to check if libpcap is installed and determines if traffic monitoring feature will be compiled into test_progs.