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).

.SRCINFO

@@ -1,7 +1,7 @@
 pkgbase = ffmpeg-full
 	pkgdesc = Complete solution to record, convert and stream audio and video (all possible features including nvenc, qsv and libfdk-aac)
 	pkgver = 4.0
-	pkgrel = 4
+	pkgrel = 5
 	url = http://www.ffmpeg.org/
 	arch = i686
 	arch = x86_64
@@ -70,8 +70,8 @@ pkgbase = ffmpeg-full
 	depends = lilv
 	depends = xz
 	depends = openal
-	depends = opencl-icd-loader
-	depends = mesa
+	depends = ocl-icd
+	depends = libgl
 	depends = sndio
 	depends = sdl2
 	depends = libxv