* gdb.base/a1-selftest.exp: Don't test "maint dump-me". That test
was a vestige of the manual TESTSTRATEGY, and the purpose of it
was to make sure that gdb can read a core file. But (a) the "read
the corefile" part didn't make it to a1-selftest.exp, we just
delete the corefile after creating it, and (b) we test reading
corefiles in corefile.exp anyway. Also, this test left around a
xgdb process on Solaris.