package/scons: fix hash of license file

Commit d4716b1e forgot to update hash of
license file. This file was updated with a "MIT License" line:
https://github.com/SCons/scons/commit/3243305c08dd93b16ae0024780a38ad51dacd5e1

Fixes:
 - http://autobuild.buildroot.org/results/43547a6015cbd0db7a9e8e7bbe7c60029db20511



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>