ffmpeg: Update from 3.4.1 to 3.4.2

packages/ffmpeg/build.sh

@@ -1,9 +1,8 @@
 TERMUX_PKG_HOMEPAGE=https://ffmpeg.org
 TERMUX_PKG_DESCRIPTION="Tools and libraries to manipulate a wide range of multimedia formats and protocols"
 # NOTE: mpv has to be rebuilt and version bumped after updating ffmpeg.
-TERMUX_PKG_VERSION=3.4.1
-TERMUX_PKG_SHA256=5a77278a63741efa74e26bf197b9bb09ac6381b9757391b922407210f0f991c0
-TERMUX_PKG_REVISION=1
+TERMUX_PKG_VERSION=3.4.2
+TERMUX_PKG_SHA256=2b92e9578ef8b3e49eeab229e69305f5f4cbc1fdaa22e927fc7fca18acccd740
 TERMUX_PKG_SRCURL=https://www.ffmpeg.org/releases/ffmpeg-${TERMUX_PKG_VERSION}.tar.xz
 # libbz2 is used by matroska decoder:
 # libvpx is the VP8 & VP9 video encoder for WebM, see