ffmpeg: update to version 4.2.5

Compile and run tested on Turris 1.1, powerpc8540

Remove PKG_MAINTAINER line as this package is in our repository and thus
we maintain it. Also, this version was not in OpenWrt. There is a newer
version for OpenWrt 21.02+

multimedia/ffmpeg/Makefile

@@ -8,14 +8,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ffmpeg
-PKG_VERSION:=4.0.6
+PKG_VERSION:=4.2.5
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=https://ffmpeg.org/releases/
-PKG_HASH:=ba093f36ef4675e7a0e778acbf3b33ce8532237186a77106d3f8f7e823ae4e51
+PKG_HASH:=574e66a7caa4b08c1d2c0e26a79559cdd23732cbc57894bd74df3989c35594c9
 
-PKG_MAINTAINER:=Ted Hess <thess@kitschensync.net>
 PKG_LICENSE:=LGPL-2.1+ GPL-2+ LGPL-3
 PKG_LICENSE_FILES:=COPYING.GPLv2 COPYING.GPLv3 COPYING.LGPLv2.1 COPYING.LGPLv3