package/micropython: Update LICENSE info

The various micropython ports may include code licensed under different
licenses compared to the core micropython. List these in MICROPYTHON_LICENSE.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/micropython/micropython.mk

@@ -6,7 +6,10 @@
 
 MICROPYTHON_VERSION = 1.14
 MICROPYTHON_SITE = $(call github,micropython,micropython,v$(MICROPYTHON_VERSION))
-MICROPYTHON_LICENSE = MIT
+# Micropython has a lot of code copied from other projects, and also a number
+# of submodules for various libs. However, we don't even clone the submodules,
+# and most of the copied code is not used in the unix build.
+MICROPYTHON_LICENSE = MIT, BSD-1-clause, BSD-3-clause, Zlib
 MICROPYTHON_LICENSE_FILES = LICENSE
 MICROPYTHON_DEPENDENCIES = host-pkgconf libffi $(BR2_PYTHON3_HOST_DEPENDENCY)