Merge from Gnulib

This incorporates:
2018-01-05 maint: Add encoding marker for Emacs to non-ASCII sources
2018-01-04 update-copyright: Handle use of ©
2018-01-04 pthread_sigmask: Avoid compilation error on mingw
2018-01-02 stat-time: silence -Wunused-parameter regression
* build-aux/config.guess, build-aux/config.sub:
* build-aux/update-copyright, doc/misc/texinfo.tex, lib/gnulib.mk.in:
* lib/md5.c, lib/md5.h, lib/sha1.c, lib/sha1.h, lib/sha256.c:
* lib/sha256.h, lib/sha512.c, lib/sha512.h, lib/signal.in.h:
* lib/stat-time.h: Copy from Gnulib, or regenerate.

1 files changed, 3 insertions, 7 deletions

diff --git a/lib/stat-time.h b/lib/stat-time.h
index 5f8bf4e126f..104f5376682 100644
--- a/lib/stat-time.h
+++ b/lib/stat-time.h
@@ -102,15 +102,13 @@ get_stat_mtime_ns (struct stat const *st)
 
 /* Return the nanosecond component of *ST's birth time.  */
 _GL_STAT_TIME_INLINE long int _GL_ATTRIBUTE_PURE
-get_stat_birthtime_ns (struct stat const *st)
+get_stat_birthtime_ns (struct stat const *st _GL_UNUSED)
 {
 # if defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC
   return STAT_TIMESPEC (st, st_birthtim).tv_nsec;
 # elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC
   return STAT_TIMESPEC_NS (st, st_birthtim);
 # else
-  /* Avoid a "parameter unused" warning.  */
-  (void) st;
   return 0;
 # endif
 }
@@ -160,7 +158,7 @@ get_stat_mtime (struct stat const *st)
 /* Return *ST's birth time, if available; otherwise return a value
    with tv_sec and tv_nsec both equal to -1.  */
 _GL_STAT_TIME_INLINE struct timespec _GL_ATTRIBUTE_PURE
-get_stat_birthtime (struct stat const *st)
+get_stat_birthtime (struct stat const *st _GL_UNUSED)
 {
   struct timespec t;
 
@@ -184,8 +182,6 @@ get_stat_birthtime (struct stat const *st)
   /* Birth time is not supported.  */
   t.tv_sec = -1;
   t.tv_nsec = -1;
-  /* Avoid a "parameter unused" warning.  */
-  (void) st;
 #endif
 
 #if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \
@@ -212,7 +208,7 @@ get_stat_birthtime (struct stat const *st)
    errno to EOVERFLOW if normalization overflowed.  This function
    is intended to be private to this .h file.  */
 _GL_STAT_TIME_INLINE int
-stat_time_normalize (int result, struct stat *st)
+stat_time_normalize (int result, struct stat *st _GL_UNUSED)
 {
 #if defined __sun && defined STAT_TIMESPEC
   if (result == 0)