Restored support for Automake's silent rules

This commit was SVN r22741.

ompi/contrib/vt/vt/configure.in

@@ -8,6 +8,9 @@ AC_CONFIG_MACRO_DIR(config/m4)
 AM_INIT_AUTOMAKE
 AM_CONFIG_HEADER(config.h)
 
+# If Automake supports silent rules, enable them.
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+
 # Check whether we are inside Open MPI package
 inside_openmpi="no"
 AC_ARG_WITH(openmpi-inside, [],