Moves definition of MATRIX_SIZE to avoid redefinition.

gameplay/src/MathUtilNeon.inl

@@ -1,3 +1,5 @@
+#define MATRIX_SIZE ( sizeof(float) * 16)
+
 namespace gameplay
 {
 

gameplay/src/Matrix.cpp

@@ -3,8 +3,6 @@
 #include "Quaternion.h"
 #include "MathUtil.h"
 
-#define MATRIX_SIZE     ( sizeof(float) * 16 )
-
 namespace gameplay
 {