use automake-1.11's silent-rules option, when possible

Don't use mylibtool, (subsumed by automake's silent rules)
Its use was causing a non-srcdir build to fail.
* Makefile.am (EXTRA_DIST): Remove mylibtool.
* configure.in: Don't use mylibtool.

* configure.in: Use AM_SILENT_RULES([yes]),
but only if that m4 macro is defined.
Thus, it works even on systems that lack automake-1.11.
Daniel Berrange suggested adding the conditional, so that
we don't have a hard requirement on 1.11, e.g., for RHEL5.

Makefile.am

@@ -19,8 +19,7 @@ EXTRA_DIST = \
   .x-sc_require_config_h \
   .x-sc_prohibit_nonreentrant \
   Makefile.nonreentrant \
-  autogen.sh \
-  mylibtool
+  autogen.sh
 
 man_MANS = virsh.1
 

configure.in

@@ -6,6 +6,11 @@ AC_CONFIG_AUX_DIR([build-aux])
 AM_CONFIG_HEADER([config.h])
 dnl Make automake keep quiet about wildcards & other GNUmake-isms
 AM_INIT_AUTOMAKE([-Wno-portability])
+
+# Use the silent-rules feature when possible.
+m4_ifndef([AM_SILENT_RULES], [m4_define([AM_SILENT_RULES],[])])
+AM_SILENT_RULES([yes])
+
 AC_CANONICAL_HOST
 
 LIBVIRT_MAJOR_VERSION=`echo $VERSION | awk -F. '{print $1}'`
@@ -58,10 +63,6 @@ dnl Support building Win32 DLLs (must appear *before* AM_PROG_LIBTOOL)
 AC_LIBTOOL_WIN32_DLL
 
 AM_PROG_LIBTOOL
-dnl Override normal libtool in favour of our quiet version
-LIBTOOL='$(SHELL) $(top_srcdir)/mylibtool'
-AC_SUBST([LIBTOOL])
-
 AM_PROG_CC_C_O
 
 VERSION_SCRIPT_FLAGS=-Wl,--version-script=