Support (locale-info 'paper) on MS-Windows

* src/w32proc.c (LOCALE_IPAPERSIZE): Define if undefined.
(nl_langinfo): Support _NL_PAPER_WIDTH and _NL_PAPER_HEIGHT
like glibc does.
* src/fns.c (Flocale_info): Update the doc string.

* nt/inc/langinfo.h: Add _NL_PAPER_WIDTH and _NL_PAPER_HEIGHT
to the enumeration.
(_NL_PAPER_WIDTH, _NL_PAPER_HEIGHT): Define namesake macros.
* nt/mingw-cfg.site (emacs_cv_langinfo__nl_paper_width): Set
to 'yes'.

* doc/lispref/nonascii.texi (Locales): Update the
documentation of 'locale-info' for the argument of 'paper'.

* etc/NEWS: Update the locale-info entry.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/fns.c b/src/fns.c
index a7279b13552..95bafae6c4c 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -3100,8 +3100,9 @@ ITEM should be one of the following:
 
 `months', returning a 12-element vector of month names (locale items MON_n);
 
-`paper', returning a list (WIDTH HEIGHT) for the default paper size,
-  both measured in millimeters (locale items PAPER_WIDTH, PAPER_HEIGHT).
+`paper', returning a list of 2 integers (WIDTH HEIGHT) for the default
+  paper size, both measured in millimeters (locale items _NL_PAPER_WIDTH,
+  _NL_PAPER_HEIGHT).
 
 If the system can't provide such information through a call to
 `nl_langinfo', or if ITEM isn't from the list above, return nil.