Makefile: add -Werror=discarded-qualifiers to the C flags
Makefile: add -Werror=discarded-qualifiers to the C flags

Because C allows this:

  void f(int *x);
  void g(const int *x)
  { f(x); }

Signed-off-by: Thiago Macieira <0ed1648d92ca0373297a182b1dba1b974ad10d88@intel.com>

intel/tinycbor,intel/tinycbor,intel/tinycbor,intel/tinycbor