ci: enable ffmpeg by default for Windows and Linux x86 targets

scripts/lib.sh

@@ -9,6 +9,27 @@ die_configure()
 	die
 }
 
+get_ffmpeg_archive()
+{
+	if [ "$GH_CPU_OS" == "win32" ]; then
+		A=win
+	else
+		A="$GH_CPU_OS"
+	fi
+
+	if [ "$GH_CPU_ARCH" == "amd64" ]; then
+		B=64
+	elif [ "$GH_CPU_ARCH" == "i386" ]; then
+		B=32
+	else
+		B="$GH_CPU_ARCH"
+	fi
+
+	FLAVOR=lgpl-shared-minimal
+
+	echo "ffmpeg-n$FFMPEG_VERSION-latest-$A$B-$FLAVOR-$FFMPEG_VERSION"
+}
+
 if [ -n "$TRAVIS_BUILD_DIR" ]; then
 	BUILDDIR=$TRAVIS_BUILD_DIR
 elif [ -n "$GITHUB_WORKSPACE" ]; then