opencv: do not override CMAKE_BUILD_TYPE

This flag is already correctly set by the cmake-package infrastructure.

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/opencv/opencv.mk

@@ -10,7 +10,6 @@ OPENCV_SOURCE  = OpenCV-$(OPENCV_VERSION).tar.bz2
 OPENCV_INSTALL_STAGING = YES
 
 OPENCV_CONF_OPT += \
-	-DCMAKE_BUILD_TYPE=$(if $(BR2_ENABLE_DEBUG),Debug,Release)   \
 	-DBUILD_WITH_STATIC_CRT=OFF                                  \
 	-DBUILD_DOCS=OFF                                             \
 	-DBUILD_EXAMPLES=OFF                                         \