testing/libthai: update config.sub to support loongarch64

testing/libthai/APKBUILD

@@ -11,6 +11,12 @@ makedepends="doxygen libdatrie libdatrie-dev"
 subpackages="$pkgname-dev $pkgname-doc"
 source="https://github.com/tlwg/libthai/releases/download/v$pkgver/libthai-$pkgver.tar.xz"
 
+prepare() {
+	default_prepare
+	# update config.sub to recognize loongarch64-alpine-linux-musl
+	update_config_sub
+}
+
 build() {
 	./configure \
 		--build="$CBUILD" \