* gdb.base/break-entry.exp: Move the target use_gdb_stub test before
starting GDB.
* gdb.base/default.exp: Replace target use_gdb_stub checks by global
$use_gdb_stub.
* gdb.base/display.exp: Likewise.
* gdb.base/ending-run.exp: Likewise.
* gdb.base/list.exp (test_listsize): Likewise.
* gdb.base/setshow.exp: Likewise.
* gdb.base/valgrind-db-attach.exp: Set global use_gdb_stub to 1.
* lib/gdb.exp (gdb_run_cmd, gdb_start_cmd): Replace target use_gdb_stub
check by global $use_gdb_stub.
(gdb_test_multiple): Forbid run, start or attach for !$use_gdb_stub.
(default_gdb_start): Set global use_gdb_stub from target use_gdb_stub.
(default_gdb_init): Unset global $use_gdb_stub.
(gdb_continue_to_end, rerun_to_main): Replace target use_gdb_stub check
by global $use_gdb_stub.
* lib/gdbserver-support.exp: Extend comments for set_board_info
gdb_protocol and gdb,socketport.
(gdbserver_start_extended): Set global gdbserver_protocol and
gdbserver_gdbport. Clear global use_gdb_stub.
* lib/mi-support.exp (default_mi_gdb_start): Set global use_gdb_stub
from target use_gdb_stub.
(mi_run_cmd): Replace target use_gdb_stub check by global $use_gdb_stub.
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