[configure] Fix up

configure.ac

@@ -58,9 +58,6 @@ m4_define([hb_libtool_current],
 HB_LIBTOOL_VERSION_INFO=hb_libtool_current:hb_libtool_revision:hb_libtool_age
 AC_SUBST(HB_LIBTOOL_VERSION_INFO)
 
-cxx_version=`$CXX --version`
-AC_SUBST(cxx_version)
-
 AC_ARG_WITH([libstdc++],
 	[AS_HELP_STRING([--with-libstdc++=@<:@yes/no@:>@],
 			[Allow linking with libstdc++ @<:@default=no@:>@])],
@@ -518,13 +515,15 @@ docs/version.xml
 
 AC_OUTPUT
 
+echo
+echo "C++ compiler version:"
+$CXX --version
+echo
+
 AC_MSG_NOTICE([
 
 Build configuration:
 
-C++ compiler version:
-${cxx_version}
-
 Unicode callbacks (you want at least one):
 	Builtin (UCDN):		${have_ucdn}
 	Glib:			${have_glib}