[riot-notifications] [RIOT-OS/RIOT] makefiles/cflags.inc.mk: handle optional cflags (#12123)

Gaëtan Harter notifications at github.com
Mon Sep 2 12:35:47 CEST 2019

You can either export `OPTIONAL_CFLAGS_BLACKLIST="-Wformat-overflow -Wformat-truncation"` in your environment to globally disable checking for this warning or, as @jcarrano define it per board in a `RIOT_MAKEFILES_GLOBAL_PRE`.

Also, note, only the `arm-none-eabi-gcc` downloaded from `arm` is supported 
(wich was previously https://launchpad.net/gcc-arm-embedded)

Even the one from `ubuntu-bionic` is blacklisted as does not work at all with `RIOT`. https://github.com/RIOT-OS/RIOT/pull/10404

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