cpu/esp32: always include libc_gettimeofday [backport 2022.04] #18030
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Backport of #18027
Contribution description
Tries to fix the issue described in RIOT-OS/Release-Specs#247 (comment), I'm not sure why this does not fail more loudly, is there a
weak
implementation being used instead? Does the same thing need to be done foresp8266
?Testing procedure
I sadly don't have the hardware to test maybe @benpicco could? I would want to do as in https://github.com/RIOT-OS/Release-Specs/blob/faafe7bcbaf13751b9b07cf5490a7bead13faa27/08-interop/README.md#task-13---icmpv6-echo-between-esp-and-named-internet-host-through-linux-with-6lowpan/
Issues/PRs references
#RIOT-OS/Release-Specs#247