depends: switch aom-git to libaom

libaom 1.0.0 was released and now upstream ffmpeg is accepting
to compile with this stable version, which was not possible with
libaom 0.1.0.

This will remove the dependency on a -git package, which is good
and desirable when possible.

.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 = 4.0.1
-	pkgrel = 1
+	pkgrel = 2
 	url = http://www.ffmpeg.org/
 	arch = i686
 	arch = x86_64
@@ -83,7 +83,7 @@ pkgbase = ffmpeg-full
 	depends = libdrm
 	depends = libvdpau
 	depends = chromaprint-fftw
-	depends = aom-git
+	depends = libaom
 	depends = codec2
 	depends = flite1-patched
 	depends = libilbc