common: redefine readchar and putsnonl
common: redefine readchar and putsnonl

Signed-off-by: Karol Gugala <38af71640571ee4b5093d4f69ffca1ac454f2948@antmicro.com>

google/CFU-Playground,google/CFU-Playground,google/CFU-Playground,google/CFU-Playground