Add pgp check. Remove makepkg internal function. Cleanups.

.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 = 4.0.2
-	pkgrel = 4
+	pkgrel = 5
 	url = http://www.ffmpeg.org/
 	arch = i686
 	arch = x86_64
@@ -98,11 +98,6 @@ pkgbase = ffmpeg-full
 	depends = libmysofa
 	depends = rockchip-mpp
 	provides = ffmpeg
-	provides = ffmpeg-full-nvenc
-	provides = ffmpeg-nvenc
-	provides = ffmpeg-libfdk_aac
-	provides = ffmpeg-decklink
-	provides = qt-faststart
 	provides = libavutil.so
 	provides = libavcodec.so
 	provides = libavformat.so
@@ -113,17 +108,12 @@ pkgbase = ffmpeg-full
 	provides = libswresample.so
 	provides = libpostproc.so
 	conflicts = ffmpeg
-	conflicts = ffmpeg-full-nvenc
-	conflicts = ffmpeg-nvenc
-	conflicts = ffmpeg-libfdk_aac
-	conflicts = ffmpeg-decklink
-	conflicts = ffmpeg-git
-	conflicts = ffmpeg-full-git
-	conflicts = ffmpeg-semifull-git
-	conflicts = ffmpeg-qsv-git
 	source = https://ffmpeg.org/releases/ffmpeg-4.0.2.tar.xz
+	source = https://ffmpeg.org/releases/ffmpeg-4.0.2.tar.xz.asc
 	source = LICENSE
+	validpgpkeys = FCF986EA15E6E293A5644F10B4322F04D67658D8
 	sha256sums = a95c0cc9eb990e94031d2183f2e6e444cc61c99f6f182d1575c433d62afb2f97
+	sha256sums = SKIP
 	sha256sums = 04a7176400907fd7db0d69116b99de49e582a6e176b3bfb36a03e50a4cb26a36
 	source_x86_64 = vmaf-1.3.9-fix.patch
 	depends_x86_64 = cuda