opencv: remove setup_vars_opencv4.sh

Currently opencv ships with setup_vars_opencv4.sh, but there comes below
error:
 # /usr/bin/setup_vars_opencv4.sh
 Setting vars for OpenCV 4.5.2
 Append PYTHONPATH: /usr/bin/../lib/python3.9/site-packages
 # ls /usr/bin/../lib/python3.9/site-packages
 ls: cannot access '/usr/bin/../lib/python3.9/site-packages': No such file or directory

Considering the file is useless and also removed in other distribution [1],
so remove the file to avoid confusing.

[1] https://src.fedoraproject.org/rpms/opencv/blob/rawhide/f/opencv.spec#_424

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/opencv/opencv_4.5.2.bb

@@ -230,4 +230,8 @@ do_install:append() {
         sed -e 's@${STAGING_DIR_HOST}@@g' \
             -i ${D}${libdir}/cmake/opencv4/OpenCVModules.cmake
     fi
+    # remove setup_vars_opencv4.sh as its content is confusing and useless
+    if [ -f ${D}${bindir}/setup_vars_opencv4.sh ]; then
+        rm -rf ${D}${bindir}/setup_vars_opencv4.sh
+    fi
 }