Fix ln -s calls on Windows

autoconf detects what the system should use to link files

libdca/Makefile.am

@@ -12,7 +12,7 @@ pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libdca.pc libdts.pc
 
 install-exec-hook:
-	ln -sf "$(DESTDIR)$(libdir)/libdca.a" "$(DESTDIR)$(libdir)/libdts.a"
+	$(LN_S)f "$(DESTDIR)$(libdir)/libdca.a" "$(DESTDIR)$(libdir)/libdts.a"
 
 uninstall-hook:
 	unlink "$(DESTDIR)$(libdir)/libdts.a"