Added -a, --get-asserts option to spdycat

If this option is used, spdycat also downloads assets such as
stylesheets, images and script files linked from the downloaded
resource. They are queued in the same SPDY session.

configure.ac

@@ -95,6 +95,13 @@ if test "x${have_openssl}" = "xno"; then
   AC_MSG_NOTICE([The example programs will not be built.])
 fi
 
+# libxml2 (for examples/spdycat)
+AM_PATH_XML2(2.7.7, [have_libxml2=yes])
+if test "x${have_libxml2}" = "xyes"; then
+  AC_DEFINE([HAVE_LIBXML2], [1], [Define to 1 if you have `libxml2` library.])
+fi
+AM_CONDITIONAL([HAVE_LIBXML2], [ test "x${have_libxml2}" = "xyes" ])
+
 # The example programs depend on OpenSSL
 enable_examples=$have_openssl
 AM_CONDITIONAL([ENABLE_EXAMPLES], [ test "x${enable_examples}" = "xyes" ])