maint: Add encoding marker for Emacs to non-ASCII sources.

Similar to commit f406941a8a2ec5fbf3eacc386b9be09d6593d53b
from Paul Eggert <eggert@cs.ucla.edu> 2015-09-24.

To determine the file list that need the marker, I used the command:

for f in `find . -type f | grep -v '^\./\.git/' | grep -v '^\./tests/'`; do
  if iconv -f ASCII -t ASCII < $f > /dev/null 2>&1 ; then : ; else
    if iconv -f UTF-8 -t UTF-8 < $f > /dev/null 2>&1 ; then
      if grep 'The GNU C Library is' $f > /dev/null; then :; else
        if grep 'coding: utf-8' $f > /dev/null; then :; else
          echo $f
        fi
      fi
    fi
  fi
done | LC_ALL=C sort

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/md5.h b/lib/md5.h
index 4b9113ad2f..d5d3c0167f 100644
--- a/lib/md5.h
+++ b/lib/md5.h
@@ -133,3 +133,10 @@ extern int __md5_stream (FILE *stream, void *resblock) __THROW;
 # endif
 
 #endif /* md5.h */
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */