Update opencv dependency

ffmpeg have just added support for opencv4[1] in the git master
branch. Added the patch here, so now opencv2 dependency from the
AUR can be dropped, and we can use the opencv package from the
official repositories while opencv5 is not yet released.

[1] https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/c4ce51ee62205c74604767f1b7dab6a036edac7f

PKGBUILD

@@ -3,7 +3,7 @@
 
 pkgname=ffmpeg-full
 pkgver=8.0
-pkgrel=3
+pkgrel=4
 _svt_hevc_ver='ed80959ebb5586aa7763c91a397d44be1798587c'
 _obs_studio_ver='32.0.2'
 _whispercpp_ver='1.8.2'
@@ -88,7 +88,7 @@ depends=(
     'openal'
     'openapv'
     'opencore-amr'
-    'opencv2'
+    'opencv'
     'openh264'
     'openjpeg2'
     'openvino'
@@ -171,6 +171,7 @@ source=("https://ffmpeg.org/releases/ffmpeg-${pkgver}.tar.xz"{,.asc}
         '070-ffmpeg-lcevcdec4.0.0-fix.patch'::'https://git.ffmpeg.org/gitweb/ffmpeg.git/patch/fa23202cc7baab899894e8d22d82851a84967848'
         '080-ffmpeg-cuda13-fix.patch'::'https://git.ffmpeg.org/gitweb/ffmpeg.git/patch/f8a300c6739ea2ca648579d7faf3ae9811b9f19a'
         '090-ffmpeg-glslang16-fix.patch'::'https://git.ffmpeg.org/gitweb/ffmpeg.git/patch/f1e9032a2000b8b885cffd6fed8eacd47b37673f'
+        '100-ffmpeg-add-opencv4-support.patch'::'https://git.ffmpeg.org/gitweb/ffmpeg.git/patch/c4ce51ee62205c74604767f1b7dab6a036edac7f'
         'LICENSE')
 sha256sums=('b2751fccb6cc4c77708113cd78b561059b6fa904b24162fa0be2d60273d27b8e'
             'SKIP'
@@ -186,6 +187,7 @@ sha256sums=('b2751fccb6cc4c77708113cd78b561059b6fa904b24162fa0be2d60273d27b8e'
             'd2bacb3a5b0201503554c3394ea1f3fbc8ad79d5c2721e0c226134d40812ad08'
             '79e3fbc30c86e0db789af78e79dc23227e5f6887531bcd52b2defa8526d1455b'
             '0010bf826a7008452ccc8a072b0186688e8687be0dbe2be2ca7540e26ca076f1'
+            'f5b448f7e6e567273f74ed6e62ed25d8470f6bc9183c247993f1c03e78b57587'
             '04a7176400907fd7db0d69116b99de49e582a6e176b3bfb36a03e50a4cb26a36')
 validpgpkeys=('FCF986EA15E6E293A5644F10B4322F04D67658D8')
 
@@ -200,6 +202,7 @@ prepare() {
     patch -d "ffmpeg-${pkgver}" -Np1 -i "${srcdir}/070-ffmpeg-lcevcdec4.0.0-fix.patch"
     patch -d "ffmpeg-${pkgver}" -Np1 -i "${srcdir}/080-ffmpeg-cuda13-fix.patch"
     patch -d "ffmpeg-${pkgver}" -Np1 -i "${srcdir}/090-ffmpeg-glslang16-fix.patch"
+    patch -d "ffmpeg-${pkgver}" -Np1 -i "${srcdir}/100-ffmpeg-add-opencv4-support.patch"
 }
 
 build() {