* gdb.base/annota1.exp: Accept no frames-invalid notification

	* gdb.base/annota1.exp: Accept no frames-invalid notification
	when starting up the program.
	* gdb.python/py-value.exp (test_value_numeric_ops): Pointers may
	show a symbolic value as well.
	* gdb.server/server-exec-info.exp: Skip test when skipping
	gdbserver test and/or when skipping shared library tests.
	* gdb.threads/linux-dp.exp: Unset "seen" when done with it to
	avoid name conflicts with other tests.