maint: Don't ignore libvirtd.pod any longer

Starting from commit 5b479f3b, libvirtd.pod is a source file
rather than a generated file. Update ignore patterns accordingly.

.gitignore

@@ -60,7 +60,6 @@
 /daemon/libvirtd
 /daemon/libvirtd*.logrotate
 /daemon/libvirtd.init
-/daemon/libvirtd.pod
 /daemon/libvirtd.policy
 /daemon/libvirtd.service
 /daemon/test_libvirtd.aug