Merge include/libiberty.h from GCC

Merge include/libiberty.h from GCC

This pulls in some missing prototypes and also adds corresponding entries
to the ChangeLog file. Please note that for one function, strverscmp(),
the ChangeLog entry was already there, but the actual prototype wasn't.

  These ChangeLog entries are added:

	2014-10-28  Yury Gribov  <y.gribov@samsung.com>

	       * libiberty.h (strtol, strtoul, strtoll, strtoull): New prototypes.

	2014-10-15  David Malcolm  <dmalcolm@redhat.com>

	       * libiberty.h (choose_tmpdir): New prototype.