sonic-visualiser: use generic libatomic checks

srcpkgs/sonic-visualiser/template

@@ -17,10 +17,9 @@ changelog="https://code.soundsoftware.ac.uk/projects/sonic-visualiser/repository
 distfiles="https://code.soundsoftware.ac.uk/attachments/download/2607/${pkgname}-${version}.tar.gz"
 checksum=e6e9dbec686c9dc94d32dff311eb0f6b44b63d3643285b3d8d908dfb9b22c790
 
-case "$XBPS_TARGET_MACHINE" in
-	ppc64*) ;;
-	armv6*|ppc*) makedepends+=" libatomic-devel" ;;
-esac
+if [ "$XBPS_TARGET_NO_ATOMIC8" ]; then
+	makedepends+=" libatomic-devel"
+fi
 
 if [ "$CROSS_BUILD" ]; then
 	hostmakedepends+=" qt5-qmake qt5-svg-devel"
@@ -37,10 +36,9 @@ post_extract() {
 		 test-svcore-system.pro
 	fi
 
-	case "$XBPS_TARGET_MACHINE" in
-		ppc64*) ;;
-		armv6*|ppc*) sed -i -e "s/^linux\*:LIBS +=.*/& -latomic/" config.pri.in ;;
-	esac
+	if [ "$XBPS_TARGET_NO_ATOMIC8" ]; then
+		sed -i -e "s/^linux\*:LIBS +=.*/& -latomic/" config.pri.in
+	fi
 }
 
 do_install() {