Fixed $G report issue with M7 and M8 both enabled.

[fix] When M7 and M8 are both enabled, $G report would show `M78`,
rather than `M7 M8`. This only effects systems that enable M7 mist
coolant in config.h. Not the default build.

doc/log/commit_log_v1.1.txt

@@ -1,3 +1,12 @@
+----------------
+Date: 2017-02-27
+Author: Sonny Jeon
+Subject: Fixed shared build info code.
+
+- The build info options of “two switches on an axis” and “homing init
+lock” shared the same letter ‘L’. The former is now ’T’.
+
+
 ----------------
 Date: 2017-02-23
 Author: Sonny Jeon

grbl/grbl.h

@@ -23,7 +23,7 @@
 
 // Grbl versioning system
 #define GRBL_VERSION "1.1f"
-#define GRBL_VERSION_BUILD "20170227"
+#define GRBL_VERSION_BUILD "20170302"
 
 // Define standard libraries used by Grbl.
 #include <avr/io.h>

grbl/report.c

@@ -316,13 +316,13 @@ void report_gcode_modes()
     case SPINDLE_DISABLE : serial_write('5'); break;
   }
 
-  report_util_gcode_modes_M();
   #ifdef ENABLE_M7
     if (gc_state.modal.coolant) { // Note: Multiple coolant states may be active at the same time.
-      if (gc_state.modal.coolant & PL_COND_FLAG_COOLANT_MIST) { serial_write('7'); }
-      if (gc_state.modal.coolant & PL_COND_FLAG_COOLANT_FLOOD) { serial_write('8'); }
-    } else { serial_write('9'); }
+      if (gc_state.modal.coolant & PL_COND_FLAG_COOLANT_MIST) { report_util_gcode_modes_M(); serial_write('7'); }
+      if (gc_state.modal.coolant & PL_COND_FLAG_COOLANT_FLOOD) { report_util_gcode_modes_M(); serial_write('8'); }
+    } else { report_util_gcode_modes_M(); serial_write('9'); }
   #else
+    report_util_gcode_modes_M();
     if (gc_state.modal.coolant) { serial_write('8'); }
     else { serial_write('9'); }
   #endif