config-post: Remove duplicated 'undef WITH_CAPNG'

Signed-off-by: NRadostin Stoyanov <rstoyanov1@gmail.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>
Signed-off-by: NJán Tomko <jtomko@redhat.com>

config-post.h

@@ -69,7 +69,6 @@
 # undef WITH_VIRTUALPORT
 # undef WITH_SECDRIVER_SELINUX
 # undef WITH_SECDRIVER_APPARMOR
-# undef WITH_CAPNG
 #endif /* LIBVIRT_NSS */
 
 #ifndef __GNUC__