games-arcade/SpaceCadetPinball: keyword 2.1.0 for ~arm64

Closes: https://github.com/gentoo/guru/pull/130
Signed-off-by: David Roman <davidroman96@gmail.com>

games-arcade/SpaceCadetPinball/SpaceCadetPinball-2.1.0.ebuild

@@ -11,7 +11,7 @@ SRC_URI="https://github.com/k4zmu2a/${PN}/archive/refs/tags/Release_${PV}.tar.gz
 
 LICENSE="MIT"
 SLOT="0"
-KEYWORDS="~amd64"
+KEYWORDS="~amd64 ~arm64"
 
 DEPEND="
 	media-libs/libsdl2