Revert "Use minimal AMF-headers tarball instead of downloading full repo"

This reverts commit fb8ff05.

Author: Markus Perl

build-ffmpeg

@@ -1028,7 +1028,7 @@ if [[ "$OSTYPE" == "linux-gnu" ]]; then
     download "https://github.com/GPUOpen-LibrariesAndSDKs/AMF/releases/download/v$CURRENT_PACKAGE_VERSION/AMF-headers-v$CURRENT_PACKAGE_VERSION.tar.gz" "AMF-$CURRENT_PACKAGE_VERSION.tar.gz" "AMF-$CURRENT_PACKAGE_VERSION"
     execute rm -rf "${WORKSPACE}/include/AMF"
     execute mkdir -p "${WORKSPACE}/include/AMF"
-    execute cp -r "${PACKAGES}"/AMF-$CURRENT_PACKAGE_VERSION/AMF-$CURRENT_PACKAGE_VERSION/AMF/* "${WORKSPACE}/include/AMF/"
+    execute cp -r "${PACKAGES}"/AMF-$CURRENT_PACKAGE_VERSION/AMF-$CURRENT_PACKAGE_VERSION/amf/public/include/* "${WORKSPACE}/include/AMF/"
     build_done "amf" $CURRENT_PACKAGE_VERSION
   fi
   CONFIGURE_OPTIONS+=("--enable-amf")