Re-add test line that I had thought was useless, but isn't

Justin Fichtner

2017-11-30 e73964b0ad7f080d398251157bd46255b0032783

 libscpi/inc/scpi/cc.h

@@ -116,6 +116,8 @@
#if defined(__AVR__)
#include <stdlib.h>
#define HAVE_DTOSTRE            1
#undef HAVE_STRTOF
#define HAVE_STRTOF            0
#endif

/* default values */