src: fix deprecated-non-prototype compile warnings

Tested on Fedora 37 with clang 15.

util-strlcatu.c:45:8: error: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
size_t strlcat(dst, src, siz)
           ^
1 error generated.

(cherry picked from commit 41ca206fdf)

src/util-strlcatu.c

@@ -42,10 +42,7 @@ static char *rcsid = "$OpenBSD: strlcat.c,v 1.5 2001/01/13 16:17:24 millert Exp
  * Returns strlen(initial dst) + strlen(src); if retval >= siz,
  * truncation occurred.
  */
-size_t strlcat(dst, src, siz)
-    char *dst;
-    const char *src;
-    size_t siz;
+size_t strlcat(char *dst, const char *src, size_t siz)
 {
     register char *d = dst;
     register const char *s = src;

src/util-strlcpyu.c

@@ -40,10 +40,7 @@ static char *rcsid = "$OpenBSD: strlcpy.c,v 1.4 1999/05/01 18:56:41 millert Exp
  * will be copied.  Always NUL terminates (unless siz == 0).
  * Returns strlen(src); if retval >= siz, truncation occurred.
  */
-size_t strlcpy(dst, src, siz)
-    char *dst;
-    const char *src;
-    size_t siz;
+size_t strlcpy(char *dst, const char *src, size_t siz)
 {
     register char *d = dst;
     register const char *s = src;