Move intel-media-sdk from makedepends_x86_64 to depends_x86_64

Since intel-media-sdk is needed not only for building with
Intel QSV support but also for Intel QSV to work during runtime, it
makes sense to stay in depends as a needed component. Forgot to do
it in previous commit. Another option instead of placing it only in
depends would be to place it in makedepends + optdepends because
ffmpeg runs without intel-media-sdk installed (libmfx.a is a static
dispatcher library that calls other sdk components at runtime).
Currently I'm sticking with the depends-only solution.

.SRCINFO

@@ -1,7 +1,7 @@
 pkgbase = ffmpeg-full
 	pkgdesc = Record, convert and stream audio and video (all possible features including nvenc, qsv and libfdk-aac)
 	pkgver = 3.4.2
-	pkgrel = 6
+	pkgrel = 7
 	url = http://www.ffmpeg.org/
 	arch = i686
 	arch = x86_64
@@ -124,8 +124,8 @@ pkgbase = ffmpeg-full
 	sha256sums = 04a7176400907fd7db0d69116b99de49e582a6e176b3bfb36a03e50a4cb26a36
 	depends_x86_64 = cuda
 	depends_x86_64 = nvidia-utils
+	depends_x86_64 = intel-media-sdk
 	makedepends_x86_64 = vmaf
-	makedepends_x86_64 = intel-media-sdk
 
 pkgname = ffmpeg-full