[riot-notifications] [RIOT-OS/RIOT] makefile: Fix usage error with busybox grep (#15852)

Marian Buschsieweke notifications at github.com
Mon Jan 25 11:08:32 CET 2021

@maribu approved this pull request.

ACK. I see no regressions with GNU `grep` and the short options match the long ones according to `grep --help`.

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