Move from sendsig() to its callers the initsiginfo() calls and

Move from sendsig() to its callers the initsiginfo() calls and
instead of passing sendsig() the code+type+val, pass a siginfo_t*
to copy from.  Eliminate the indirection through struct emul for
sendsig(); we no longer have a SunOS4-compat version of sendsig()

ok deraadt@