gnulib update, formatting policy change

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I will shortly be updating gnulib on branch-1.4, branch-1.6, and master.
Now that gnulib (and also coreutils) no longer use TABs, I've decided to
adopt the same policy for m4 (git is pretty reasonable about ignoring
whitespace when blaming changes to files, so with the right options, you
don't get spurious blames to this commit).

2009-12-28  Eric Blake  <[email protected]>

	Update to latest gnulib.
	* gnulib: Update.
	* build-aux/.cvsignore: Regenerate.
	* build-aux/.gitignore: Likewise.

2009-12-14  Eric Blake  <[email protected]>

	Document new indentation policy.
	* HACKING: Document indentation policy.
	* .x-sc_prohibit_tab_based_indentation: New file.
	* cfg.mk (sc_prohibit_tab_based_indentation): New rule.
	* Makefile.am (syntax_check_exceptions): New macro.
	(EXTRA_DIST): Distribute exception files.

	Switch to indentation by space, not tab.
	* .gitmodules: Convert leading tabs to spaces.
	* TODO: Likewise.
	* bootstrap: Likewise.
	* c-boxes.el: Likewise.
	* checks/check-them: Likewise.
	* checks/get-them: Likewise.
	* checks/stackovf.test: Likewise.
	* configure.ac: Likewise.
	* src/builtin.c: Likewise.
	* src/debug.c: Likewise.
	* src/eval.c: Likewise.
	* src/format.c: Likewise.
	* src/freeze.c: Likewise.
	* src/input.c: Likewise.
	* src/m4.c: Likewise.
	* src/m4.h: Likewise.
	* src/macro.c: Likewise.
	* src/output.c: Likewise.
	* src/path.c: Likewise.
	* src/symtab.c: Likewise.

	Update to latest gnulib.
	* gnulib: Update.
	* m4/gnulib-cache.m4: Import xoset.
	* src/output.c (includes): Ensure that gnulib oset usage will
	call xalloc_die on memory failure.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             [email protected]
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