Add LibTIRPC to the dependency chain.

--- fam-2.7.0/configure.ac.orig	2012-03-26 19:45:40.283143769 +1300
+++ fam-2.7.0/configure.ac	2012-03-26 19:45:57.324144441 +1300
@@ -27,6 +27,7 @@ dnl AC_PROG_RANLIB
 
 # Checks for libraries.
 AC_CHECK_LIB([rpcsvc], [pmap_set])
+AC_CHECK_LIB([tirpc], [pmap_set])
 
 # Checks for header files.
 AC_HEADER_STDC