Should Gatekeeper adopt libelf?

Can `libelf` simplify and make the code in file `cps/elf.c` more robust? DPDK already uses `libelf` when the compiling option `CONFIG_RTE_LIBRTE_BPF_ELF` is enabled; the option is found in file `dpdk/config/common_base`.

If `libelf` can simplify the code in file `cps/elf.c`, one has to rewrite it to use `libelf` in order to close this issue.