redo change#2061 and parts of change#1169 with code in the

redo change#2061 and parts of change#1169 with code in the
parser; PL_last_proto hackery gone, strict 'subs' in now
implemented in the optimizer where specifying the exceptional
cases is much more robust; '*' (bareword) prototype now works
reliably when used in second and subsequent arguments

p4raw-link: @2061 on //depot/perl: bf8481137c02593eb36f8d0e234a2ec41a1c92e4
p4raw-link: @1169 on //depot/perl: 2a841d1398ee9bbf30a942905192cc2591b3e92a

p4raw-id: //depot/perl@3447