PATCH: Eliminate unused temporary file in DejaGnu library tests

This patch avoids creating a temporary file that is not actually used, 
since clone_output has avoided using sum_file if it is an empty string 
since the code was first imported into this repository.

This is part of initial efforts to isolate default_target_compile into a 
testing environment.

(Also, Emacs is complaining about whitespace in ChangeLog again.)

----
ChangeLog entry:
	* testsuite/runtest.libs/default_procs.tcl: Set sum_file to empty
	string instead of opening a temporary file named .tmp.
	* testsuite/runtest.libs/libs.exp: No longer need to remove .tmp.
---
diff --git a/testsuite/runtest.libs/default_procs.tcl b/testsuite/runtest.libs/default_procs.tcl
index 1305672..e2e0c6b 100644
--- a/testsuite/runtest.libs/default_procs.tcl
+++ b/testsuite/runtest.libs/default_procs.tcl
@@ -1,4 +1,4 @@
-set sum_file [open .tmp w]
+set sum_file ""
 set reboot 0
 set errno ""
 
diff --git a/testsuite/runtest.libs/libs.exp b/testsuite/runtest.libs/libs.exp
index f42d3db..e688ab3 100644
--- a/testsuite/runtest.libs/libs.exp
+++ b/testsuite/runtest.libs/libs.exp
@@ -101,6 +101,3 @@ foreach i [glob [testsuite file -source -test *.test]] {
     if { [runtest_file_p $runtests $i] } { process_test $i }
 }
 stop_expect
-
-# Clean up behind ourselves.
-file delete .tmp
----



-- Jacob