A few test bug fixes:

* Never use "touch" in make rules; it breaks on most sub-second
    supporting systems.  Use echo "" > $@ instead.
  * Forgot to close test makefiles before using them!

All the above worked fine on Linux but failed miserably on Solaris.

tests/scripts/features/export

@@ -131,6 +131,8 @@ all:
 
 EOF
 
+close(MAKEFILE);
+
 &run_make_with_options($makefile2,"",&get_logfile,0);
 $answer = "foo=f-ok bar=b-ok\nfoo=f-ok bar=b-ok\n";
 &compare_output($answer,&get_logfile(1));
@@ -164,6 +166,8 @@ all:
 
 EOF
 
+close(MAKEFILE);
+
 &run_make_with_options($makefile3,"",&get_logfile,0);
 $answer = "foo=f-ok bar=b-ok\nfoo= bar=\n";
 &compare_output($answer,&get_logfile(1));