package/python-future: fix dependency

python-future does not depends on python2.
The package work with python 3.x.

Signed-off-by: Louis Aussedat <aussedat.louis@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 2f3fc105877b506ef7ae0db91e7d4598cbb67704)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/python-future/Config.in

@@ -1,6 +1,5 @@
 config BR2_PACKAGE_PYTHON_FUTURE
 	bool "python-future"
-	depends on BR2_PACKAGE_PYTHON
 	help
 	  Easy, clean, reliable Python 2/3 compatibility.