Fix up gdb/qemu driver to only load status once, effectively.
/* * NB: QEMU's gdb stub removes all breakpoints on '?', so we have to * only call this on target attach! We have to trust our status as * TARGET_PAUSED when we call gdb_pause(), if it succeeds. This * must also be the gdb client's default behavior, although I don't * think I saw this in the protocol docs. */ (And of course gdb stubs always send stop statuses on breakpoint exception or whatever... so strictly speaking, we don't need to rely on this call at all.)