snapshot 3 in preparation for 1.4.13

[Eric Blake]

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[bcc'ing everyone who responded to snapshot 2; thanks again for your
previous feedback]

One more snapshot before the final release of M4 1.4.13; this one adds
some gnulib fixes for some (but not all) of the reported issues from last
snapshot; it also adds some optimizations that result in faster m4 speed.
 Known issues from the previous round for which no one has done any
investigation:

On some older platforms, the gnulib tests test-fseeko and test-ftello
fail, due to a bug in the platforms' ungetc behavior.  Without a gnulib
replacement for ungetc, this won't be fixed, but it does not affect m4
behavior.

On some FreeBSD platforms, the gnulib test test-wcrtomb fails in some
locales.  This does not affect m4, which only uses the C locale.

On a DEC Alpha platform, there were two m4 test failures; 174.format
failed in such a way that it implies printf("%f") is not supported by libc
but the replacement gnulib printf was not picked up, and 191.sysval failed
with a different value than expected for system(3).  I'm not sure whether
this can be easily fixed.

The snapshot is available at:

http://home.comcast.net/~ericblake/m4-1.4.12.27-ccc137.tar.gz [1.2M]
http://home.comcast.net/~ericblake/m4-1.4.12.27-ccc137.tar.gz.asc
http://home.comcast.net/~ericblake/m4-1.4.12.27-ccc137.tar.bz2 [947K]
http://home.comcast.net/~ericblake/m4-1.4.12.27-ccc137.tar.bz2.asc
http://home.comcast.net/~ericblake/m4-1.4.12.27-ccc137.tar.lzma [788K]
http://home.comcast.net/~ericblake/m4-1.4.12.27-ccc137.tar.lzma.asc

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

Eric Blake             address@hidden
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