Fix FFmpeg vulnerability

See http://www.mail-archive.com/arch-dev-public@archlinux.org/msg24095.html

PKGBUILD

@@ -11,7 +11,7 @@
 
 pkgname=ffmpeg-full
 pkgver=2.8.4
-pkgrel=1
+pkgrel=2
 epoch=1
 pkgdesc='Complete solution to record, convert and stream audio and video (with all options)'
 arch=('i686' 'x86_64')
@@ -127,7 +127,8 @@ build() {
     --enable-runtime-cpudetect \
     --enable-swresample \
     --enable-vdpau \
-    --enable-version3
+    --enable-version3 \
+    --disable-demuxer='hls' --disable-protocol='concat,hls' # FS#47738
 
   make
   make tools/qt-faststart