package/opencv3: add webp support

webp support is available since version 3.0.0 and
https://github.com/opencv/opencv/commit/500b7318beee639d8c341e9ea63ac7610ca225f4

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
diff --git a/package/opencv3/opencv3.mk b/package/opencv3/opencv3.mk
index 648cc66..12d2e3c 100644
--- a/package/opencv3/opencv3.mk
+++ b/package/opencv3/opencv3.mk
@@ -223,7 +223,6 @@
 	-DWITH_VA=OFF \
 	-DWITH_VA_INTEL=OFF \
 	-DWITH_VTK=OFF \
-	-DWITH_WEBP=OFF \
 	-DWITH_XINE=OFF
 
 OPENCV3_DEPENDENCIES += host-pkgconf zlib
@@ -318,6 +317,13 @@
 OPENCV3_CONF_OPTS += -DWITH_V4L=OFF -DWITH_LIBV4L=OFF
 endif
 
+ifeq ($(BR2_PACKAGE_OPENCV3_WITH_WEBP),y)
+OPENCV3_CONF_OPTS += -DWITH_WEBP=ON
+OPENCV3_DEPENDENCIES += webp
+else
+OPENCV3_CONF_OPTS += -DWITH_WEBP=OFF
+endif
+
 ifeq ($(BR2_PACKAGE_OPENCV3_LIB_PYTHON),y)
 OPENCV3_CONF_OPTS += \
 	-DBUILD_opencv_python2=OFF \