[riot-notifications] [RIOT-OS/RIOT] sys: stdio_null: add null driver (#10741)

Juan I Carrano notifications at github.com
Mon Jan 14 18:06:46 CET 2019

I added commit to #9258 ([this one](https://github.com/RIOT-OS/RIOT/pull/9258/commits/dd1ab99c5ddde4a5bf602f680a3077e77cc41201)) that provides this same functionality, but without adding a null driver. Instead I intercept read() and write() (actually, the reentrant versions). I think it is important to be honest about the fact that it is a stub and set error codes appropriately. 

Space savings are similar, but I need to rebase my branch on top of yours to do a proper comparison.

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