Add missing includes for compilation with C23
https://bugs.gentoo.org/880799
diff '--color=auto' -ru bss-0.8.old/bss.c bss-0.8/bss.c
--- a/bss.c	2025-03-28 23:12:14.780857512 +0300
+++ b/bss.c	2025-03-28 23:13:44.003579006 +0300
@@ -34,6 +34,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#include <time.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/socket.h>
diff '--color=auto' -ru bss-0.8.old/replace.c bss-0.8/replace.c
--- a/replace.c	2025-03-28 23:12:14.780857512 +0300
+++ b/replace.c	2025-03-28 23:14:07.107852000 +0300
@@ -10,6 +10,7 @@
 // Modifications by Ollie Whitehouse <ol at uncon dot org>
 // 
 #include <stdio.h>
+#include <string.h>
 
 char *replace(char *string, char *oldpiece, char *newpiece) {