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

Similar to commit f406941a8a
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

build-aux/update-copyright

@@ -264,7 +264,9 @@ else
     print STDERR "$ARGV: warning: copyright statement not found\n";
   }
 
+# Hey Emacs!
 # Local variables:
+# coding: utf-8
 # mode: perl
 # indent-tabs-mode: nil
 # eval: (add-hook 'write-file-hooks 'time-stamp)

lib/getprogname.c

@@ -182,3 +182,10 @@ getprogname (void)
 }
 
 #endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */

lib/md5.c

@@ -469,3 +469,10 @@ md5_process_block (const void *buffer, size_t len, struct md5_ctx *ctx)
   ctx->D = D;
 }
 #endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */

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:
+ */

lib/memxor.h

@@ -28,3 +28,10 @@
 void *memxor (void *restrict dest, const void *restrict src, size_t n);
 
 #endif /* MEMXOR_H */
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */

lib/quotearg.c

@@ -1080,3 +1080,10 @@ quote (char const *arg)
 {
   return quote_n (0, arg);
 }
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */

lib/sha1.c

@@ -434,3 +434,10 @@ sha1_process_block (const void *buffer, size_t len, struct sha1_ctx *ctx)
     }
 }
 #endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */

lib/sha1.h

@@ -98,3 +98,10 @@ extern int sha1_stream (FILE *stream, void *resblock);
 # endif
 
 #endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */

lib/sha256.c

@@ -577,3 +577,10 @@ sha256_process_block (const void *buffer, size_t len, struct sha256_ctx *ctx)
     }
 }
 #endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */

lib/sha256.h

@@ -101,3 +101,10 @@ extern int sha224_stream (FILE *stream, void *resblock);
 # endif
 
 #endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */

lib/sha512.c

@@ -629,3 +629,10 @@ sha512_process_block (const void *buffer, size_t len, struct sha512_ctx *ctx)
     }
 }
 #endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */

lib/sha512.h

@@ -104,3 +104,10 @@ extern int sha384_stream (FILE *stream, void *resblock);
 # endif
 
 #endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */

lib/sm3.c

@@ -489,3 +489,10 @@ sm3_process_block (const void *buffer, size_t len, struct sm3_ctx *ctx)
     }
 }
 #endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */

lib/sm3.h

@@ -100,3 +100,10 @@ extern int sm3_stream (FILE *stream, void *resblock);
 # endif
 
 #endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */