package/live555: license is now LGPL-3.0+ and not LGPL-2.1+

The live555 source code includes both a COPYING file (with the GPL-3.0
license text) and a COPYING.LESSER file (with the LGPL-3.0 license
text). However, all source files indicate a LGPL-3.0 license, and none
of them indicate a GPL-3.0 license. In addition,
http://live555.com/liveMedia/faq.html#copyright-and-license says the
source code is under the LGPL.

So, we:

- Bump LGPL License to 3.0+
- Add a comment about the GPL-3.0 license

Fixes:

- https://bugs.busybox.net/show_bug.cgi?id=13156

Signed-off-by: Michael Nosthoff <buildroot@heine.tech>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/live555/live555.hash

@@ -2,4 +2,4 @@
 md5  327bc53f60361c6d703d52e86f476f11  live.2020.06.25.tar.gz
 # Locally generated
 sha256  f206309f10d281990889b7a0c92c26a7fa55ac0e8568bf594b9b27433b4db585  live.2020.06.25.tar.gz
-sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING
+sha256  da7eabb7bafdf7d3ae5e9f223aa5bdc1eece45ac569dc21b3b037520b4464768  COPYING.LESSER

package/live555/live555.mk

@@ -7,8 +7,12 @@
 LIVE555_VERSION = 2020.06.25
 LIVE555_SOURCE = live.$(LIVE555_VERSION).tar.gz
 LIVE555_SITE = http://www.live555.com/liveMedia/public
-LIVE555_LICENSE = LGPL-2.1+
-LIVE555_LICENSE_FILES = COPYING
+# There is a COPYING file with the GPL-3.0 license text, but none of
+# the source files appear to be released under GPL-3.0, and the
+# project web site says it's licensed under the LGPL:
+# http://live555.com/liveMedia/faq.html#copyright-and-license
+LIVE555_LICENSE = LGPL-3.0+
+LIVE555_LICENSE_FILES = COPYING.LESSER
 LIVE555_INSTALL_STAGING = YES
 
 LIVE555_CFLAGS = $(TARGET_CFLAGS)