ash: finally installed it as /bin/sh on my machine.

ash: finally installed it as /bin/sh on my machine.
 some breakage noticed, the most dire is mishandled ^C.
 fixing it.

function                                             old     new   delta
blocking_wait_with_raise_on_sig                        -      40     +40
waitforjob                                            85     100     +15
setsignal                                            280     278      -2
evalvar                                             1376    1374      -2
waitcmd                                              186     182      -4
dowait                                               350     316     -34
redirect                                            1231    1185     -46
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/5 up/down: 55/-88)            Total: -33 bytes