dist: ln(1) is not guaranteed to have a '-f' option

According to the autoconf manual, using '$(LN_S) -f' is not
portable; remove the target explicitly beforehand to work around
this limitation.

Adjust some slightly awkward indentation while at it.

src/Makefile.am

@@ -3079,7 +3079,8 @@ if WITH_NETWORK
 	      $(DESTDIR)$(confdir)/qemu/networks/default.xml && \
 	    rm $(DESTDIR)$(confdir)/qemu/networks/default.xml.t; }
 	( cd $(DESTDIR)$(confdir)/qemu/networks/autostart && \
-	    $(LN_S) -f ../default.xml default.xml )
+	  rm -f default.xml && \
+	  $(LN_S) ../default.xml default.xml )
 endif WITH_NETWORK
 
 uninstall-local:: uninstall-init uninstall-systemd

tools/Makefile.am

@@ -424,7 +424,8 @@ NSS_SO_VER = 1
 
 install-exec-hook:
 	( cd $(DESTDIR)$(libdir) && \
-	  $(LN_S) -f libnss_libvirt.so.$(NSS_SO_VER) nss_libvirt.so.$(NSS_SO_VER) )
+	  rm -f nss_libvirt.so.$(NSS_SO_VER) && \
+	  $(LN_S) libnss_libvirt.so.$(NSS_SO_VER) nss_libvirt.so.$(NSS_SO_VER) )
 
 uninstall-local:
 	-rm -f $(DESTDIR)$(libdir)/nss_libvirt.so.$(NSS_SO_VER)