package/libiec61850: security bump to version 1.5.1

- Retrieve official tarball
- Fix CVE-2021-45769: A NULL pointer dereference in
  AcseConnection_parseMessage at src/mms/iso_acse/acse.c of libiec61850
  v1.5.0 can lead to a segmentation fault or application crash.
- Fix many other vulnerabilities:
  https://libiec61850.com/new-release-1-5-1-of-libiec61850

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 52c372446f034cf8277951ad083abe5e1c10f52d)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libiec61850/libiec61850.hash

@@ -1,3 +1,3 @@
 # Locally computed
-sha256  7b832c195ae9f42faa1ccfe1b82b9ff187103155ce45aaca08881be98459d164  libiec61850-1.5.0.tar.gz
+sha256  b6d7ffac831e7d9aec3470e45e2f1734071859c95cab4cfe99ffd1091776b3cc  libiec61850-1.5.1.tar.gz
 sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING

package/libiec61850/libiec61850.mk

@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-LIBIEC61850_VERSION = 1.5.0
-LIBIEC61850_SITE = $(call github,mz-automation,libiec61850,v$(LIBIEC61850_VERSION))
+LIBIEC61850_VERSION = 1.5.1
+LIBIEC61850_SITE = https://libiec61850.com/wp-content/uploads/2022/03
 LIBIEC61850_INSTALL_STAGING = YES
 LIBIEC61850_LICENSE = GPL-3.0+
 LIBIEC61850_LICENSE_FILES = COPYING