[patch, testsuite] Don't "set debug lin-lwp 1" in ia64-sigill.exp

[Yao Qi <yao@codesourcery.com>]

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command "lin-lwp" is defined in linux-nat.c, so for GDB without
linux-nat.o, command "set debug lin-lwp 1" can't be found, like this:

set debug lin-lwp 1^M
Undefined set debug command: "lin-lwp 1".  Try "help set debug".^M
(gdb) FAIL: gdb.threads/ia64-sigill.exp: set debug lin-lwp 1

I examine the test code, and comment says "The ia64 SIGILL signal is
visible only in the lin-lwp debug.", however, I don't see any code
checks the lin-lwp debug output.  I think this line of code "set debug
lin-lwp 1" can be removed from this test case.

OK?

-- 
Yao (齐尧)

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2011-06-14  Yao Qi  <yao@codesourcery.com>

	gdb/testsuite/
	* gdb.threads/ia64-sigill.exp: Remove "set debug lin-lwp 1".

diff --git a/gdb/testsuite/gdb.threads/ia64-sigill.exp b/gdb/testsuite/gdb.threads/ia64-sigill.exp
index 2b0290f..93f753c 100644
--- a/gdb/testsuite/gdb.threads/ia64-sigill.exp
+++ b/gdb/testsuite/gdb.threads/ia64-sigill.exp
@@ -57,9 +57,6 @@ gdb_breakpoint [gdb_get_line_number "break-at-exit"]
 
 gdb_test_no_output "set debug infrun 1"
 
-# The ia64 SIGILL signal is visible only in the lin-lwp debug.
-gdb_test_no_output "set debug lin-lwp 1"
-
 gdb_test "continue" "Breakpoint \[0-9\]+,( .* in)? thread_func .*"
 
 gdb_test_no_output {delete $sigill_bpnum}