opencv: remove setup_vars_opencv4.sh
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 <0cde210d53ea437aa8fca279c2e91236080d61a9@windriver.com>
Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

openembedded/meta-openembedded,moto-timo/meta-openembedded,rehsack/meta-openembedded,schnitzeltony/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,schnitzeltony/meta-openembedded,moto-timo/meta-openembedded,openembedded/meta-openembedded,rehsack/meta-openembedded,moto-timo/meta-openembedded,rehsack/meta-openembedded,schnitzeltony/meta-openembedded,openembedded/meta-openembedded,schnitzeltony/meta-openembedded,moto-timo/meta-openembedded,rehsack/meta-openembedded,schnitzeltony/meta-openembedded,moto-timo/meta-openembedded,schnitzeltony/meta-openembedded,rehsack/meta-openembedded,openembedded/meta-openembedded,rehsack/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,schnitzeltony/meta-openembedded,rehsack/meta-openembedded