Removed opencv's optflow module from required dependency (#427 (comment))

Author: matlabbe

CMakeLists.txt

@@ -221,7 +221,7 @@ ENDIF()
 set(RTABMAP_QT_VERSION AUTO CACHE STRING "Force a specific Qt version.")
 set_property(CACHE RTABMAP_QT_VERSION PROPERTY STRINGS AUTO 4 5)
 
-FIND_PACKAGE(OpenCV REQUIRED QUIET COMPONENTS core calib3d imgproc highgui stitching optflow photo video OPTIONAL_COMPONENTS aruco xfeatures2d nonfree gpu cudafeatures2d)
+FIND_PACKAGE(OpenCV REQUIRED QUIET COMPONENTS core calib3d imgproc highgui stitching photo video OPTIONAL_COMPONENTS aruco xfeatures2d nonfree gpu cudafeatures2d)
 
 IF(WITH_QT)
 FIND_PACKAGE(PCL 1.7 REQUIRED QUIET COMPONENTS common io kdtree search surface filters registration sample_consensus segmentation visualization)