libvbr/vbr.c: modernize vbr_strlcpy() signature.

The vbr_strlcpy() function declares that its arguments should live in
registers:

  vbr_strlcpy(dst, src, size)
        register char *dst;
        register const char *src;
        ssize_t size;
  {
    ...

This makes GCC unhappy when -Werror=strict-prototypes is used:

  vbr.c:167:1: error: function declaration isn't a prototype
  [-Werror=strict-prototypes]
    167 | vbr_strlcpy(dst, src, size)

The "register" keyword is largely obsolete on modern systems anyway,
since the compiler is better at determining how to move memory around
than the programmer is. So to appease GCC and simplify the code a bit,
the signature has been changed to,

  vbr_strlcpy(char *dst, const char *src, ssize_t size) { ... }

changes. Lines starting # with '#' will be ignored, and an empty
message aborts the commit.  # # On branch configure.ac-c-standard #
Your branch is up to date with 'origin/configure.ac-c-standard'.  # #
Changes to be committed: # modified: libvbr/vbr.c # # Changes not
staged for commit: # modified: configure # # Untracked files: #
0000-cover-letter.patch #

libvbr/vbr.c

@@ -164,12 +164,9 @@ static void vbr_error __P((VBR *, const char *, ...));
 */
 
 size_t
-vbr_strlcpy(dst, src, size)
-	register char *dst;
-	register const char *src;
-	ssize_t size;
+vbr_strlcpy(char *dst, const char *src, ssize_t size)
 {
-	register ssize_t i;
+	ssize_t i;
 
 	if (size-- <= 0)
 		return strlen(src);