Skip two more attach tests when testing against stub-like targets

This patch updates two attach tests to use utility procs for checking if
the attach test should run and for launching the program to be attached, as
follows:

1) Use can_spawn_for_attach instead of is_remote target
2) Use spawn_wait_for_attach instead of exec/sleep

Tested (1) with i686-mingw32 host and i686-pc-linux-gnu build/target and
both with x86_64 Ubuntu.

gdb/testsuite/ChangeLog:

	* gdb.base/attach-pie-noexec.exp: Use can_spawn_for_attach
	instead of checking whether the target board is remote and
	use spawn_wait_for_attach instead of exec/sleep.
	* gdb.base/attach-twice.exp: Likewise.

1 files changed, 5 insertions, 4 deletions

diff --git a/gdb/testsuite/gdb.base/attach-pie-noexec.exp b/gdb/testsuite/gdb.base/attach-pie-noexec.exp
index f6aa1c8c21e..30a2f4d9de9 100644
--- a/gdb/testsuite/gdb.base/attach-pie-noexec.exp
+++ b/gdb/testsuite/gdb.base/attach-pie-noexec.exp
@@ -13,8 +13,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-# Manipulation with PID on target is not supported.
-if [is_remote target] then {
+if {![can_spawn_for_attach]} {
     return 0
 }
 
@@ -53,8 +52,10 @@ if {$arch == ""} {
     return 0
 }
 
-set testpid [eval exec $binfile &]
-exec sleep 2
+# Start the program running and then wait for a bit, to be sure
+# that it can be attached to.
+
+set testpid [spawn_wait_for_attach $binfile]
 
 gdb_start
 file delete -- $binfile