of SIGIO.
(input_interrupt): Don't block on read, in case we got redundant
SIGIO. Don't gripe about redundant SIGIO.
* gdbserver/low-hppabsd.c (mywait): Use waitpid(). Enable SIGIO
handler while waiting.
* gdbserver/low-linux.c (mywait): Likewise.
* gdbserver/low-nbsd.c (mywait): Likewise.
* gdbserver/low-sparc.c (mywait): Likewise.
store_inferior_registers): Support older NetBSD/powerpc systems
from before fp reg support was added. Adapt to register number
changes caused when powerpc target was multi-arched.