Removed duplicate definition

Author: Santhosh

package/wpe/wpewebkit/wpewebkit.mk

@@ -47,7 +47,6 @@ WPEWEBKIT_FLAGS = \
 	-DENABLE_SAMPLING_PROFILER=ON \
 	-DENABLE_TOUCH_EVENTS=OFF \
 	-DENABLE_FTL_JIT=OFF \
-	-DENABLE_MATHML=OFF  \
 	-DENABLE_MATHML=OFF \
 	-DENABLE_METER_ELEMENT=OFF \
 	-DENABLE_SVG_FONTS=OFF \