Transform the Count enum values into private constants

Summary:
Hides implementation details for the C, Objective-C and Swift APIs.
Closes https://github.com/facebook/yoga/pull/292

Differential Revision: D4351523

Pulled By: emilsjolander

fbshipit-source-id: 18a1149d169f0d52bd078714295000b5d07434dd

yoga/Yoga.c

@@ -133,8 +133,6 @@ static int YGAndroidLog(YGLogLevel level, const char *format, va_list args) {
     case YGLogLevelVerbose:
       androidLevel = ANDROID_LOG_VERBOSE;
       break;
-    case YGLogLevelCount:
-      break;
   }
   const int result = __android_log_vprint(androidLevel, "YG-layout", format, args);
   return result;
@@ -951,8 +949,6 @@ static void YGConstrainMaxSizeForMode(const float maxSize, YGMeasureMode *mode,
         *size = maxSize;
       }
       break;
-    case YGMeasureModeCount:
-      break;
   }
 }
 
@@ -1968,7 +1964,6 @@ static void YGNodelayoutImpl(const YGNodeRef node,
         leadingMainDim = betweenMainDim / 2;
         break;
       case YGJustifyFlexStart:
-      case YGJustifyCount:
         break;
     }
 
@@ -2171,7 +2166,6 @@ static void YGNodelayoutImpl(const YGNodeRef node,
         break;
       case YGAlignAuto:
       case YGAlignFlexStart:
-      case YGAlignCount:
         break;
     }
 
@@ -2231,7 +2225,6 @@ static void YGNodelayoutImpl(const YGNodeRef node,
                 break;
               }
               case YGAlignAuto:
-              case YGAlignCount:
                 break;
             }
           }