Makefile.in (xgcc$(exeext)): Remove choose-temp, pexecute and mkstemp.
* Makefile.in (xgcc$(exeext)): Remove choose-temp, pexecute and
mkstemp. Get them from libiberty.
(COLLECT2_OBJS): Similarly for choose-temp, cplus-dem and mkstemp.
(PROTO_OBJS): Similarly for choose-temp, getopt, getopt1 and pexecute.
(cplus-dem.o, pexecute.o, choose-temp.o): Remove build rules.
(mkstemp.o, getopt1.o, getopt.o): Likewise.