[binutils-gdb] Modify obstack.[hc] to avoid having to include other gnulib files

[sergiodj+buildbot at redhat dot com]

*** TEST RESULTS FOR COMMIT e9f40d7d68ecc03c8c32ec0acd07c35359fdb4a3 ***

Author: Alan Modra <amodra@gmail.com>
Branch: master
Commit: e9f40d7d68ecc03c8c32ec0acd07c35359fdb4a3

Modify obstack.[hc] to avoid having to include other gnulib files

Using the standard gnulib obstack source requires importing quite a
lot of other files from gnulib, and requires build changes.

include/
	PR gdb/17133
	* obstack.h (__attribute_pure__): Expand _GL_ATTRIBUTE_PURE.
libiberty/
	PR gdb/17133
	* obstack.c (__alignof__): Expand alignof_type from alignof.h.
	(obstack_exit_failure): Don't use exitfail.h.
	(_): Include libintl.h when HAVE_LIBINTL_H and nls enabled.
	Provide default.  Don't include gettext.h.
	(_Noreturn): Define.
	* obstacks.texi: Adjust node references to external libc info files.