package/python-matplotlib: add kiwisolver dependency

This is needed by matplotlib.pyplot, and is also documented at
https://matplotlib.org/users/installing.html#building-on-linux

Signed-off-by: Esben Haabendal <esben@geanix.com>
Reviewed-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/python-matplotlib/Config.in

@@ -9,6 +9,7 @@ config BR2_PACKAGE_PYTHON_MATPLOTLIB
 	select BR2_PACKAGE_PYTHON_CYCLER
 	select BR2_PACKAGE_PYTHON_SETUPTOOLS # runtime
 	select BR2_PACKAGE_PYTHON_DATEUTIL # runtime
+	select BR2_PACKAGE_PYTHON_KIWISOLVER # runtime
 	select BR2_PACKAGE_PYTHON_NUMPY # runtime
 	select BR2_PACKAGE_PYTHON_PYPARSING # runtime
 	select BR2_PACKAGE_PYTHON3_ZLIB # runtime