games-emulation/dolphin: Restrict libfmt due to build failure

Signed-off-by: Michał Górny <mgorny@gentoo.org>

games-emulation/dolphin/dolphin-5.0_p20210506-r3.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2021 Gentoo Authors
+# Copyright 1999-2022 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
@@ -29,7 +29,7 @@ IUSE="alsa bluetooth discord-presence doc +evdev ffmpeg +gui log
 
 RDEPEND="
 	dev-libs/hidapi:0=
-	>=dev-libs/libfmt-7.1:0=
+	<dev-libs/libfmt-8.1:0=
 	dev-libs/lzo:2=
 	dev-libs/pugixml:0=
 	media-libs/libpng:0=