pretty: Add ifdefs for float support
pretty: Add ifdefs for float support

Adds ifdefs around the float handling to return an CborErrorUnknownType
if compiled without floating point support

Signed-off-by: Koen Zandberg <42e3d96910f922bdd7dd1805fe3f8aff634f391d@bergzand.net>

thiagomacieira/tinycbor,intel/tinycbor,01org/tinycbor,thiagomacieira/tinycbor,intel/tinycbor,thiagomacieira/tinycbor,01org/tinycbor,thiagomacieira/tinycbor,intel/tinycbor,01org/tinycbor,intel/tinycbor