python-pygame: remove python dependency

With the dependency on BR2_PACKAGE_PYTHON it was only possible to
build the package with python2. However, python-pygame works with
python3 so enable it to be built with it.

Signed-off-by: Peter Bouda <pbouda@cidles.eu>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/python-pygame/Config.in

@@ -1,6 +1,5 @@
 config BR2_PACKAGE_PYTHON_PYGAME
 	bool "python-pygame"
-	depends on BR2_PACKAGE_PYTHON
 	select BR2_PACKAGE_SDL
 	help
 	  Pygame is a cross-platfrom library designed to make it easy to write