Revert "[automake] add the subdir-objects option to AM_INIT_AUTOMAKE flags"

This reverts commit 9f9bc5c0.

see FS#1576

bin/dunecontrol

@@ -1194,7 +1194,7 @@ case "$command" in
 
 m4_define([DUNE_AC_INIT],[
   AC_INIT([$name], [$version], [$maintainer])
-  AM_INIT_AUTOMAKE([foreign 1.9 tar-pax subdir-objects])
+  AM_INIT_AUTOMAKE([foreign 1.9 tar-pax])
   m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([no])])
   AC_SUBST([DUNE_MOD_VERSION], [$version])
   AC_SUBST([DUNE_MOD_NAME], [$name])