package/opencv3: replace PKG_PYTHON_DISTUTILS_ENV

Replace PKG_PYTHON_DISTUTILS_ENV by PKG_PYTHON_SETUPTOOLS_ENV
to avoid an issue with naming of python modules since commit
09de823cbc7bd50a40e25f4166b4e42be94b0c7b

Fixes: 09de823cbc7bd50a40e25f4166b4e42be94b0c7b

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/opencv3/opencv3.mk

@@ -341,7 +341,7 @@ OPENCV3_CONF_OPTS += \
 	-DPYTHON3_NUMPY_VERSION=$(PYTHON_NUMPY_VERSION)
 OPENCV3_DEPENDENCIES += python3
 OPENCV3_KEEP_PY_FILES += usr/lib/python$(PYTHON3_VERSION_MAJOR)/site-packages/cv2/config*.py
-OPENCV3_CONF_ENV += $(PKG_PYTHON_DISTUTILS_ENV)
+OPENCV3_CONF_ENV += $(PKG_PYTHON_SETUPTOOLS_ENV)
 OPENCV3_DEPENDENCIES += python-numpy
 else
 OPENCV3_CONF_OPTS += \