opencv: disable OpenMP support

Since there is currently no easy way to know if the current Buildroot
configuration has a toolchain supporting OpenMP (especially for external
toolchains), then just disable it.

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/opencv/opencv.mk

@@ -154,6 +154,7 @@ OPENCV_CONF_OPT += \
 	-DWITH_OPENCL=OFF  \
 	-DWITH_OPENEXR=OFF \
 	-DWITH_OPENGL=OFF  \
+	-DWITH_OPENMP=OFF  \
 	-DWITH_OPENNI=OFF  \
 	-DWITH_UNICAP=OFF  \
 	-DWITH_XINE=OFF