Makefile.in (pexecute.o): Use pexecute.c from libiberty.

Makefile.in (pexecute.o): Use pexecute.c from libiberty.

        * Makefile.in (pexecute.o): Use pexecute.c from libiberty.  Provide
        explicit rules for building.  Similarly for alloca, vfprintf,
        choose-temp and mkstemp, getopt, getopt1.
        (INCLUDES): Add $(srcdir)/../include.
        * pexecute.c, alloca.c, vfprintf.c, choose-temp.c, mkstemp.c: Delete.
        * getopt.h, getopt.c getopt1.c: Likewise.

From-SVN: r22256