Import the "pathmax" gnulib module.

Import the "pathmax" gnulib module.

This imports the "pathmax" gnulib module, making PATH_MAX always
available on systems that have the notion of a constant max path limit
(i.e., practically everywhere except the Hurd), along with fixing a
couple broken systems --- see pathmax.h in the patch.

This means we can normalize on PATH_MAX throughout the tree (instead
of some places using MAXPATHLEN, or defining fallback constants
ourselves).

This is the just the importing step.

gdb/
2013-07-01  Pedro Alves  <palves@redhat.com>

	* gnulib/update-gnulib.sh (IMPORTED_GNULIB_MODULES): Add pathmax.
	* gnulib/Makefile.in (aclocal_m4_deps): Add import/m4/pathmax.m4.
	* gnulib/aclocal.m4: Regenerate.
	* gnulib/config.in: Regenerate.
	* gnulib/configure: Regenerate.
	* gnulib/import/pathmax.h: New file.
	* gnulib/import/Makefile.am: Regenerate.
	* gnulib/import/Makefile.in: Regenerate.
	* gnulib/import/m4/gnulib-cache.m4: Regenerate.
	* gnulib/import/m4/gnulib-comp.m4: Regenerate.
	* gnulib/import/m4/pathmax.m4: New file.