package/libebml: security bump to version 1.4.2

Fix CVE-2021-3405: A flaw was found in libebml before 1.4.2. A heap
overflow bug exists in the implementation of EbmlString::ReadData and
EbmlUnicodeString::ReadData in libebml.

https://github.com/Matroska-Org/libebml/blob/release-1.4.2/ChangeLog

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

package/libebml/libebml.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256  80abc9a82549615018798ee704997270a39b43de9a6e7e0d23b62f8ce682c4b3  libebml-1.4.0.tar.xz
+sha256  41c7237ce05828fb220f62086018b080af4db4bb142f31bec0022c925889b9f2  libebml-1.4.2.tar.xz
 sha256  dc626520dcd53a22f727af3ee42c770e56c97a64fe3adb063799d8ab032fe551  LICENSE.LGPL

package/libebml/libebml.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBEBML_VERSION = 1.4.0
+LIBEBML_VERSION = 1.4.2
 LIBEBML_SOURCE = libebml-$(LIBEBML_VERSION).tar.xz
 LIBEBML_SITE = http://dl.matroska.org/downloads/libebml
 LIBEBML_INSTALL_STAGING = YES