fix: do not exit install-exec-hook when symlink already exists

Author: vjar

Makefile.am

@@ -5,5 +5,5 @@ dist_libexec_SCRIPTS = macvtap-mknod-targetpid-discovery-podman
 dist_noinst_FILES = README.md
 
 install-exec-hook:
-	ln -s macvtap-mknod-targetpid-discovery-podman $(DESTDIR)$(libexecdir)/macvtap-mknod-targetpid-discovery
+	ln -s macvtap-mknod-targetpid-discovery-podman $(DESTDIR)$(libexecdir)/macvtap-mknod-targetpid-discovery || true
 	setcap CAP_MKNOD=p $(DESTDIR)$(bindir)/macvtap-mknod-for-unprivileged-netns