Merge from gnulib

This incorporates:
2017-06-11 getopt-posix: port to glibc 2.25.90
2017-06-04 same-inode: port better to VMS 8.2 and later
* doc/misc/texinfo.tex, lib/getopt-pfx-core.h, lib/getopt-pfx-ext.h:
* m4/sys_types_h.m4: Copy from gnulib.

doc/misc/texinfo.tex

@@ -3,7 +3,7 @@
 % Load plain if necessary, i.e., if running under initex.
 \expandafter\ifx\csname fmtname\endcsname\relax\input plain\fi
 %
-\def\texinfoversion{2017-05-14.14}
+\def\texinfoversion{2017-06-04.19}
 %
 % Copyright 1985, 1986, 1988, 1990, 1991, 1992, 1993, 1994, 1995,
 % 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
@@ -5493,17 +5493,15 @@ end
       \let\indexlbrace\{   % Likewise, set these sequences for braces
       \let\indexrbrace\}   % used in the sort key.
       \begindoublecolumns
-      \let\entrywidowpenalty=\indexwidowpenalty
+      \let\dotheinsertentrybox\dotheinsertentryboxwithpenalty
       %
       % Read input from the index file line by line.
       \loopdo
-        \ifeof1
-          \let\firsttoken\relax
-        \else
+        \ifeof1 \else
           \read 1 to \nextline
-          \edef\act{\gdef\noexpand\firsttoken{\getfirsttoken\nextline}}%
-          \act
         \fi
+        %
+        \indexinputprocessing
         \thisline
         %
         \ifeof1\else
@@ -5515,12 +5513,20 @@ end
   \fi
   \closein 1
 \endgroup}
+\def\loopdo#1\repeat{\def\body{#1}\loopdoxxx}
+\def\loopdoxxx{\let\next=\relax\body\let\next=\loopdoxxx\fi\next}
 
+\def\indexinputprocessing{%
+  \ifeof1
+    \let\firsttoken\relax
+  \else
+    \edef\act{\gdef\noexpand\firsttoken{\getfirsttoken\nextline}}%
+    \act
+  \fi
+}
 \def\getfirsttoken#1{\expandafter\getfirsttokenx#1\endfirsttoken}
 \long\def\getfirsttokenx#1#2\endfirsttoken{\noexpand#1}
 
-\def\loopdo#1\repeat{\def\body{#1}\loopdoxxx}
-\def\loopdoxxx{\let\next=\relax\body\let\next=\loopdoxxx\fi\next}
 
 % These macros are used by the sorted index file itself.
 % Change them to control the appearance of the index.
@@ -5597,7 +5603,7 @@ end
     % For pdfTeX and XeTeX.
     % The redefinition of \domark stops marks being added in \pdflink to 
     % preserve coloured links across page boundaries.  Otherwise the marks
-    % would get in the way of \lastbox in \insertindexentrybox.
+    % would get in the way of \lastbox in \insertentrybox.
     \let\domark\relax
     %
     % Start a new paragraph if necessary, so our assignments below can't
@@ -5658,9 +5664,9 @@ end
     \fi
     \egroup % end \boxA
     \ifdim\wd\boxB = 0pt
-      \global\setbox\entryindexbox=\vbox{\unhbox\boxA}%
+      \global\setbox\entrybox=\vbox{\unhbox\boxA}%
     \else
-    \global\setbox\entryindexbox=\vbox\bgroup
+    \global\setbox\entrybox=\vbox\bgroup
       % We want the text of the entries to be aligned to the left, and the
       % page numbers to be aligned to the right.
       %
@@ -5722,19 +5728,20 @@ end
     \egroup % The \vbox
     \fi
   \endgroup
-  % delay text of entry until after penalty
-  \bgroup\aftergroup\insertindexentrybox
-  \entrywidowpenalty
+  \dotheinsertentrybox
 }}
 
 \newskip\thinshrinkable
 \skip\thinshrinkable=.15em minus .15em
 
-\newbox\entryindexbox
-\def\insertindexentrybox{%
-  \ourunvbox\entryindexbox
+\newbox\entrybox
+\def\insertentrybox{%
+  \ourunvbox\entrybox
 }
 
+% default definition
+\let\dotheinsertentrybox\insertentrybox
+
 % Use \lastbox to take apart vbox box by box, and add each sub-box
 % to the current vertical list.
 \def\ourunvbox#1{%
@@ -5757,21 +5764,18 @@ end
 \newbox\delayedbox
 \newbox\interbox
 
-% Default is no penalty
-\let\entrywidowpenalty\egroup
-
 % Used from \printindex.  \firsttoken should be the first token
 % after the \entry.  If it's not another \entry, we are at the last
 % line of a group of index entries, so insert a penalty to discourage
 % widowed index entries.
-\long\def\indexwidowpenalty{%
-  \def\isentry{\entry}%
+\def\dotheinsertentryboxwithpenalty{%
   \ifx\firsttoken\isentry
   \else
     \penalty 9000
   \fi
-  \egroup % now comes the box added with \aftergroup
+  \insertentrybox
 }
+\def\isentry{\entry}%
 
 % Like plain.tex's \dotfill, except uses up at least 1 em.
 % The filll stretch here overpowers both the fil and fill stretch to push