[RFC/WIP PATCH v2 01/12] Flip to set target-async on by default

[Pedro Alves <pedro@codesourcery.com>]

This flips "set target-async" to default to on.  Marc Khouzam's
earlier reply (on the v1 series) indicating Eclipse does not use
target-async for all-stop makes me think it may be prudent to actually
try this with Eclipse and see what happens.  Haven't done that though.
---
 gdb/target.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/gdb/target.c b/gdb/target.c
index 5700066..a6e146d 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -4259,11 +4259,11 @@ maintenance_print_target_stack (char *cmd, int from_tty)
 }
 
 /* Controls if async mode is permitted.  */
-int target_async_permitted = 0;
+int target_async_permitted = 1;
 
 /* The set command writes to this variable.  If the inferior is
    executing, linux_nat_async_permitted is *not* updated.  */
-static int target_async_permitted_1 = 0;
+static int target_async_permitted_1 = 1;
 
 static void
 set_maintenance_target_async_permitted (char *args, int from_tty,