reduce minimum required version for automake to 1.9

since ubuntu 8.04LTS had 1.10, I was not able to test it. The BWGrid
cluster has 1.9 and it seems to work. Thank goes to Lena for catching
this!

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@7836 2fb0f335-1f38-0410-981e-8018bf24f1b0

Makefile.am

@@ -11,8 +11,8 @@ EXTRA_DIST = dune.module \
 SUBDIRS = doc dumux m4 test tutorial
 
 # don't follow the full GNU-standard
-# we need automake 1.10
-AUTOMAKE_OPTIONS = foreign 1.10
+# we need automake 1.9 or later
+AUTOMAKE_OPTIONS = foreign 1.9
 
 # pass most important options when "make distcheck" is used
 DISTCHECK_CONFIGURE_FLAGS= CXX="$(CXX)" CC="$(CC)"