attach: impl helper bpf_override_return #339

Job	Run time
build-runtime	3m 35s
build-and-test (libbpf-tools/opensnoop, ./opensnoop, ./victim, true, 0 test.txt)	32s
build-and-test (libbpf-tools/statsnoop, ./statsnoop, ./victim, true, victim 0 0 ...	42s
build-and-test (malloc, ./malloc, ./victim, false, malloc calls: )	53s
build-and-test (minimal, ./uprobe, ./victim, false)	35s
build-and-test (opensnoop, ./opensnoop, ./victim, true, 0 test.txt)	59s
build-and-test (sslsniff, ./sslsniff, /bin/wget https://www.google.com, false, ----- DATA -----)	40s
build-and-test (libbpf-tools/bashreadline, ./readline, /bin/bash, false, info)	39s
build-and-test (libbpf-tools/syscount, ./syscount, /bin/bash, false, info)	1m 15s
	9m 50s

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