depends: change dependencies for opencl and opengl

opencl: opencl-icd-loader was replaced by ocl-icd. Although ocl-icd
        currently provides opencl-icd-loader, let's use the newer
        approach by depending directly on ocl-icd.

opengl: it seems that the best approach for depending on libGL is
        to use libgl instead of mesa. Currently it is provided by
        libglvnd package (or by nvidia-340xx-utils for legacy
        nvidia users).

PKGBUILD

@@ -4,7 +4,7 @@
 pkgname=ffmpeg-full
 _srcname=ffmpeg
 pkgver=4.0
-pkgrel=4
+pkgrel=5
 pkgdesc='Complete solution to record, convert and stream audio and video (all possible features including nvenc, qsv and libfdk-aac)'
 arch=('i686' 'x86_64')
 url='http://www.ffmpeg.org/'
@@ -19,8 +19,8 @@ depends=(
         'librsvg' 'rubberband' 'rtmpdump' 'smbclient' 'snappy' 'libsoxr' 'speex' 'srt'
         'libssh' 'tesseract' 'libtheora' 'twolame' 'v4l-utils' 'vid.stab' 'libvorbis'
         'libvpx' 'wavpack' 'libwebp' 'libx264.so' 'x265' 'libxcb' 'xvidcore' 'libxml2'
-        'zimg' 'zeromq' 'zvbi' 'lilv' 'xz' 'openal' 'opencl-icd-loader' 'mesa' 'sndio'
-        'sdl2' 'libxv' 'libx11' 'libxext' 'zlib' 'libomxil-bellagio' 'libva' 'libdrm'
+        'zimg' 'zeromq' 'zvbi' 'lilv' 'xz' 'openal' 'ocl-icd' 'libgl' 'sndio' 'sdl2'
+        'libxv' 'libx11' 'libxext' 'zlib' 'libomxil-bellagio' 'libva' 'libdrm'
         'libvdpau'
     # AUR:
         'chromaprint-fftw' 'aom-git' 'codec2' 'flite1-patched' 'libilbc' 'kvazaar'