package/python-crc16: allow to build with python3

python3 is officially supported by package, as there is a usage example
at [1]. Simply remove dependency on BR2_PACKAGE_PYTHON.

[1] https://pypi.org/project/crc16/

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit a7fdc5686bb269cc3797d7c550f10f75074f2e71)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/python-crc16/Config.in

@@ -1,6 +1,5 @@
 config BR2_PACKAGE_PYTHON_CRC16
 	bool "python-crc16"
-	depends on BR2_PACKAGE_PYTHON
 	help
 	  This library calculates only CRC16 (16-bit codes) and the
 	  only supported variant at the moment is CRC-CCITT (XModem).