ffmpeg: Update from 3.1.2 to 3.1.3

packages/ffmpeg/build.sh

@@ -1,8 +1,8 @@
 TERMUX_PKG_HOMEPAGE=https://www.ffmpeg.org/
 TERMUX_PKG_DESCRIPTION="Tools and libraries to manipulate a wide range of multimedia formats and protocols"
-TERMUX_PKG_VERSION=3.1.2
-TERMUX_PKG_BUILD_REVISION=1
+TERMUX_PKG_VERSION=3.1.3
 TERMUX_PKG_SRCURL=https://www.ffmpeg.org/releases/ffmpeg-${TERMUX_PKG_VERSION}.tar.xz
+TERMUX_PKG_SHA256=f8575c071e2a64437aeb70c8c030b385cddbe0b5cde20c9b18a6def840128822
 TERMUX_PKG_FOLDERNAME=ffmpeg-$TERMUX_PKG_VERSION
 # libbz2 is used by matroska decoder:
 TERMUX_PKG_DEPENDS="openssl, libbz2, libx264, xvidcore, libvorbis, libmp3lame, liblzma"
@@ -48,7 +48,7 @@ termux_step_configure () {
 		--enable-openssl \
 		--enable-shared \
 		--prefix=$TERMUX_PREFIX \
-		--target-os=linux \
+		--target-os=android \
 		$_EXTRA_CONFIGURE_FLAGS
 }