Use require target_can_use_run_cmd

This changes some tests to use "require target_can_use_run_cmd".

gdb/testsuite/gdb.base/annota1.exp

@@ -19,9 +19,7 @@
 # This testcase cannot use runto_main because of the different prompt
 # we get when using annotation level 2.
 #
-if ![target_can_use_run_cmd] {
-    return 0
-}
+require target_can_use_run_cmd
 
 set breakpoints_invalid "\r\n\032\032breakpoints-invalid\r\n"
 

gdb/testsuite/gdb.base/annota3.exp

@@ -19,9 +19,7 @@
 # This testcase cannot use runto_main because of the different prompt
 # we get when using annotation level 2.
 #
-if ![target_can_use_run_cmd] {
-    return 0
-}
+require target_can_use_run_cmd
 
 
 #

gdb/testsuite/gdb.base/dprintf-execution-x-script.exp

@@ -20,9 +20,7 @@
 # part of this test.
 
 # Bail out if the target can't use the 'run' command.
-if ![target_can_use_run_cmd] {
-    return 0
-}
+require target_can_use_run_cmd
 
 standard_testfile
 

gdb/testsuite/gdb.cp/annota2.exp

@@ -32,9 +32,7 @@ if {[prepare_for_testing "failed to prepare" $testfile $srcfile \
 # This testcase cannot use runto_main because of the different prompt
 # we get when using annotation level 2.
 #
-if ![target_can_use_run_cmd] {
-    return 0
-}
+require target_can_use_run_cmd
 
 set breakpoints_invalid "\r\n\032\032breakpoints-invalid\r\n"
 set frames_invalid "\r\n\032\032frames-invalid\r\n"

gdb/testsuite/gdb.cp/annota3.exp

@@ -32,9 +32,7 @@ if {[prepare_for_testing "failed to prepare" $testfile $srcfile \
 # This testcase cannot use runto_main because of the different prompt
 # we get when using annotation level 2.
 #
-if ![target_can_use_run_cmd] {
-    return 0
-}
+require target_can_use_run_cmd
 
 #
 # line number where we need to stop in main

gdb/testsuite/gdb.multi/bkpt-multi-exec.exp

@@ -13,9 +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/>.
 
-if ![target_can_use_run_cmd] {
-    return
-}
+require target_can_use_run_cmd
 
 # Until "catch exec" is implemented on other targets...
 #