Remove unnecessary and obsolete configure.ac directives

Also enable silent rules where missing

Change-Id: Ia521886815c862b013f01df4cc18fd8a298aaaa1
Signed-off-by: Damjan Marion <damarion@cisco.com>
diff --git a/vpp-api-test/configure.ac b/vpp-api-test/configure.ac
index 4d39bd8..250f74c 100644
--- a/vpp-api-test/configure.ac
+++ b/vpp-api-test/configure.ac
@@ -1,10 +1,9 @@
 AC_INIT(vpp-api-test, 1.0)
 LT_INIT
 AM_INIT_AUTOMAKE
+AM_SILENT_RULES([yes])
 
-AM_PROG_AS
 AC_PROG_CC
-AM_PROG_CC_C_O
 
 AC_ARG_WITH(q-plugin-prefix,
             AC_HELP_STRING([--with-q-plugin-prefix],[vlib plugin prefix]),