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/perftool/configure.ac b/perftool/configure.ac
index 37a4174..f4a9869 100644
--- a/perftool/configure.ac
+++ b/perftool/configure.ac
@@ -1,5 +1,6 @@
 AC_INIT(perftool, 2.0)
 AM_INIT_AUTOMAKE
+AM_SILENT_RULES([yes])
 
 AC_CHECK_LIB([vppinfra], [clib_mem_get_page_size],,
         AC_MSG_ERROR([Please install the vpp-lib package]))
@@ -7,6 +8,5 @@
         AC_MSG_ERROR([Please install the vpp-dev package]))
 
 AM_PROG_LIBTOOL
-AM_PROG_CC_C_O
 
 AC_OUTPUT([Makefile])