[bugfix] Fix autotools to have the webpage build again

Conans ancient compiler has problems since the latest
changes to the Dune Exceptions. We switch the dune-common
check to a more easy header...

m4/dune_common.m4

@@ -82,7 +82,7 @@ AC_DEFUN([DUNE_COMMON_CHECKS],
 
 AC_DEFUN([DUNE_COMMON_CHECK_MODULE],
 [
-    DUNE_CHECK_MODULES([dune-common], [common/stdstreams.hh],
+    DUNE_CHECK_MODULES([dune-common], [common/version.hh],
 	[#ifndef DUNE_MINIMAL_DEBUG_LEVEL
    #define DUNE_MINIMAL_DEBUG_LEVEL 1
    #endif