main/multipath-tools: avoid /usr/lib64

Enforce lib instead of lib64 regardless if /lib64 exists or not.
No changes in built package.

main/multipath-tools/APKBUILD

@@ -26,7 +26,7 @@ build() {
 }
 
 package() {
-	make prefix="/usr" SYSTEMDPATH="/lib" DESTDIR="$pkgdir" install
+	make prefix="/usr" SYSTEMDPATH="/lib" LIB=lib DESTDIR="$pkgdir" install
 
 	install -D -m644 "$srcdir"/$pkgname.conf \
 		"$pkgdir"/etc/multipath.conf