configure.ac: remove option subdir-objects as it causes fortran compilation to fail

configure.ac

@@ -59,8 +59,9 @@ AC_CANONICAL_SYSTEM
 
 dnl Automake 1.11 introduced `silent-rules' and `color-tests'.  Use them
 dnl when they're available.
+dnl do not use option subdir-objects, it causes fortran compilation to fail
 m4_ifdef([AM_SILENT_RULES],
-  [AM_INIT_AUTOMAKE([1.11 -Wall foreign silent-rules color-tests parallel-tests subdir-objects])],
+  [AM_INIT_AUTOMAKE([1.11 -Wall foreign silent-rules color-tests parallel-tests])],
   [AM_INIT_AUTOMAKE([1.10 -Wall foreign])])
 
 m4_ifdef([AM_SILENT_RULES],