Edit hard limit check at start of homing cycle

gcode.h

@@ -164,6 +164,7 @@ typedef struct {
   float spindle_speed;          // RPM
   float feed_rate;              // Millimeters/min
   uint8_t tool;                 // Tracks tool number. NOT USED.
+//   int32_t line_number;          // Last line number sent
 
   float position[N_AXIS];       // Where the interpreter considers the tool to be at this point in the code