opencv: enable NEON optimizations if possible

Signed-off-by: Andre Renaud <andre@ignavus.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/opencv/opencv.mk

@@ -79,7 +79,8 @@ OPENCV_CONF_OPTS += \
 	-DENABLE_SSE3=$(if $(BR2_X86_CPU_HAS_SSE3),ON,OFF) \
 	-DENABLE_SSE41=$(if $(BR2_X86_CPU_HAS_SSE4),ON,OFF) \
 	-DENABLE_SSE42=$(if $(BR2_X86_CPU_HAS_SSE42),ON,OFF) \
-	-DENABLE_SSSE3=$(if $(BR2_X86_CPU_HAS_SSSE3),ON,OFF)
+	-DENABLE_SSSE3=$(if $(BR2_X86_CPU_HAS_SSSE3),ON,OFF) \
+	-DENABLE_NEON=$(if $(BR2_ARM_CPU_HAS_NEON),ON,OFF)
 
 # Cuda stuff
 OPENCV_CONF_OPTS += \