fixed bug in determination of module version

[[Imported from SVN: r5043]]

configure.ac

@@ -4,7 +4,7 @@
 
 # get module version from dune.module file
 m4_define([DUNE_MOD_VERSION],
-  [m4_esyscmd([grep ^Version: dune.module | sed -e 's/^.*://' -e 's/\s*//'])])
+  [m4_esyscmd([grep ^Version: dune.module | tr '\n' ' ' | sed -e 's/^.*://' -e 's/\s*//'])])
 AC_INIT(dune-common, DUNE_MOD_VERSION, dune@dune-project.org)
 AM_INIT_AUTOMAKE
 AC_CONFIG_SRCDIR([common/stdstreams.cc])