[RFC][PATCH v4 00/11][BZ 10871] Month names in genitive case

[Rafal Luzynski <digitalfreak@lingonborough.com>]

This is the third version of my attempt to fix the bug 10871. [1]
The first version has been sent to this list in January, [2] the
second version has been sent in March, [3] the third version has
been sent on October 18 [4].

The main difference between the previous set of patches and this
new one is that this new one also implements the backward
compatibility for __nl_langinfo_l(), [5] __strftime_l(), and
__wcsftime_l(). [6]

This set of patches deliberately skips some patches which have
not been changed since the previous version.  I hope this avoids
some noise.

Here is a short description of the following patches:

1. Add the alternative month names support to nl_langinfo(3) (the
ALTMON_... constants.)  This new patch does not change
conform/data/langinfo.h-data, as requested in [7].

2. Provide backward compatibility for nl_langinfo(),
nl_langinfo_l(), and also __nl_langinfo_l(), as requested in [5].

3. Rebuild abilists to reflect nl_langinfo(), nl_langinfo_l(),
and __nl_langinfo_l() changes - generated automatically, also rebased.

4. Deliberately skipped because not changed, you can find it here:
   https://sourceware.org/ml/libc-alpha/2016-10/msg00281.html

5. Deliberately skipped because not changed, you can find it here:
   https://sourceware.org/ml/libc-alpha/2016-10/msg00282.html

6. Provide backward compatibility for strftime(), strftime_l(),
wcsftime(), wcsftime_l(), and also __strftime_l() and __wcsftime_l(),
as requested in [6].

7. Rebuild abilists to reflect the changes in strftime(), strftime_l(),
wcsftime(), wcsftime_l(), and also __strftime_l() and __wcsftime_l()
- generated automatically, also rebased.

8-11. Deliberately skipped because not changed, you can find them:
   https://sourceware.org/ml/libc-alpha/2016-10/msg00285.html
   https://sourceware.org/ml/libc-alpha/2016-10/msg00286.html
   https://sourceware.org/ml/libc-alpha/2016-10/msg00287.html
   https://sourceware.org/ml/libc-alpha/2016-10/msg00288.html

I'll appreciate your reviews and comments.

Best regards,

Rafal Luzynski

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=10871
[2] https://sourceware.org/ml/libc-alpha/2016-01/msg00143.html
[3] https://sourceware.org/ml/libc-alpha/2016-03/msg00616.html
[4] https://sourceware.org/ml/libc-alpha/2016-10/msg00277.html
[5] https://sourceware.org/bugzilla/show_bug.cgi?id=10871#c58
[6] https://sourceware.org/ml/libc-alpha/2016-10/msg00304.html
[7] https://sourceware.org/ml/libc-alpha/2016-10/msg00303.html