build: remove references to WITH_YAJL for SETUID_RPC_CLIENT

We no longer allow building WITH_YAJL, remove the remaining
uses of the macro.
Signed-off-by: NJán Tomko <jtomko@redhat.com>

config-post.h

@@ -44,8 +44,6 @@
 # undef WITH_SSH2
 # undef WITH_SYSTEMD_DAEMON
 # undef WITH_VIRTUALPORT
-# undef WITH_YAJL
-# undef WITH_YAJL2
 #endif
 
 /*