clearify the new rpc situation (we don't even need it)

Author: teuben

src/subs/sma_mirRead.c

@@ -233,6 +233,8 @@
 #include <math.h>
 //#include <rpc/rpc.h>    // in recent glibc header this was moved. Both redhat and ubuntu now  have issues finding it
                           // which might be solved with the lib(n)tirpc-dev(el) - seems like a messy "upgrade" to me.
+                          // use an extra -I/usr/include/tirpc if you need this feature
+                          // it seems this code doesn't use RPC
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>