Fix leftover call to removed function macros_dump.

[Ralf Wildenhues]

This fixes a theoretical bug introduced with incomplete renaming in a
2003-05-25 patch.  I do not know how to trigger the failure path except
by actually introducing the bug in automake.in (tested by replacing the
'if' condition with one that evaluates to true).

For maint.

Cheers,
Ralf

    Fix leftover call to removed function macros_dump.
    
    * automake.in (read_main_am_file): Call variables_dump, not
    macros_dump.  Print actual error before list of variables.

diff --git a/automake.in b/automake.in
index 490c23f..baccad5 100644
--- a/automake.in
+++ b/automake.in
@@ -7050,7 +7050,7 @@ sub read_main_am_file
     my ($amfile) = @_;
 
     # This supports the strange variable tricks we are about to play.
-    prog_error (macros_dump () . "variable defined before read_main_am_file")
+    prog_error ("variable defined before read_main_am_file\n" . variables_dump 
())
       if (scalar (variables) > 0);
 
     # Generate copyright header for generated Makefile.in.