[riot-notifications] [RIOT-OS/RIOT] sys: add pseudomodule scanf_float (#11511)

Kaspar Schleiser notifications at github.com
Tue May 14 14:24:33 CEST 2019

This PR's ```tests/minimal``` without ```USEMODULE += scanf_float```:

   text    data     bss     dec     hex filename
   2980      16    2540    5536    15a0 /home/kaspar/src/riot.tmp/tests/minimal/bin/samr21-xpro/tests_minimal.elf

With ``√ôSEMODULE += scanf_float``` added to the makefile:
   text    data     bss     dec     hex filename
  21152     488    2548   24188    5e7c /home/kaspar/src/riot.tmp/tests/minimal/bin/samr21-xpro/tests_minimal.elf

That's just too expensive to enable by default. For float in general, the number one rule on embedded systems is "don't use at all".

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