package/libcodec2: fix upstream source URL

Upstream changed to URL of the source tarball and removed SHA1SUMS.
Added license hash.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libcodec2/libcodec2.hash

@@ -1,4 +1,3 @@
-# sha1 from http://files.freedv.org/codec2/SHA1SUMS
-sha1   8988aa33121b857d58a16f75b5061281b254a146	codec-0.7.tar.xz
 # Locally computed
 sha256 0695bb93cd985dd39f02f0db35ebc28a98b9b88747318f90774aba5f374eadb2  codec2-0.7.tar.xz
+sha256 9ebb6f82b7380a62ac74c5f0322c88e6744dedf2ebe1f54d6f088282b39844bf  COPYING

package/libcodec2/libcodec2.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 LIBCODEC2_VERSION = 0.7
-LIBCODEC2_SITE = http://files.freedv.org/codec2
+LIBCODEC2_SITE = https://freedv.com/wp-content/uploads/sites/8/2017/10
 LIBCODEC2_SOURCE = codec2-$(LIBCODEC2_VERSION).tar.xz
 LIBCODEC2_LICENSE = LGPL-2.1
 LIBCODEC2_LICENSE_FILES = COPYING