allow older xslt libs, we can conditionally build a missing function easily

svn path=/icecast/trunk/m4/; revision=9737

m4/xiph_xml2.m4

@@ -52,7 +52,7 @@ ac_xslt_save_LIBS="$LIBS"
 ac_xslt_save_CFLAGS="$CFLAGS"
 LIBS="$XSLT_LIBS $LIBS"
 CFLAGS="$CFLAGS $XSLT_CFLAGS"
-AC_CHECK_FUNC(xsltSaveResultToString,,[AC_MSG_ERROR([Unable to link with libxslt (>=v1.0.18)])])
+AC_CHECK_FUNCS([xsltSaveResultToString])
 CFLAGS="$ac_xslt_save_CFLAGS"
 LIBS="$ac_xslt_save_LIBS"
 ])