* gdb.base/async-shell.exp: Skip the testfile for use_gdb_stub.
* gdb.base/attach-pie-misread.exp: Likewise.
* gdb.base/break-interp.exp: Likewise.
* gdb.base/default.exp (attach, run "r" abbreviation, run): Skip these
testcases for use_gdb_stub.
* gdb.dwarf2/dw2-restore.exp: Fix the run for use_gdb_stub.
(continue): New testcase.
* gdb.python/py-events.exp: Skip the testfile for use_gdb_stub.
* gdb.threads/attach-into-signal.exp: Likewise.
* gdb.threads/attach-stopped.exp: Likewise.
* gdb.threads/attachstop-mt.exp: Likewise.
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