dev-lang/swift-bin: correct KEYWORDS

`swift-bin` is currently only built for amd64 and doesn't work on other
architectures; the KEYWORDS need to reflect this.

Signed-off-by: Itai Ferber <itai@itaiferber.net>

dev-lang/swift-bin/swift-bin-5.10.1-r5.ebuild

@@ -15,7 +15,7 @@ S="${WORKDIR}"
 
 LICENSE="Apache-2.0 GPL-2"
 SLOT="5/10"
-KEYWORDS="~amd64"
+KEYWORDS="-* ~amd64"
 REQUIRED_USE="${PYTHON_REQUIRED_USE}"
 
 RESTRICT="strip"

dev-lang/swift-bin/swift-bin-6.2.3.ebuild

@@ -15,7 +15,7 @@ S="${WORKDIR}"
 
 LICENSE="Apache-2.0 GPL-2"
 SLOT="6/2"
-KEYWORDS="~amd64"
+KEYWORDS="-* ~amd64"
 REQUIRED_USE="${PYTHON_REQUIRED_USE}"
 
 RESTRICT="strip"