configure.in: Use kernel style silent rules starting with automake 1.11
Use the silent rules when they are available. Using make V=1 or a
special configure option the silent rules can be disabled.
diff --git a/openbsc/configure.in b/openbsc/configure.in
index 94fb15f..25c5029 100644
--- a/openbsc/configure.in
+++ b/openbsc/configure.in
@@ -3,6 +3,9 @@
AM_INIT_AUTOMAKE(openbsc, 0.0alpha1)
+dnl kernel style compile messages
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+
dnl checks for programs
AC_PROG_MAKE_SET
AC_PROG_CC