Update 'Kanzlei-Kiel'.

Kanzlei-Kiel/src/djbdns/djbdns-1.05/case_lowerb.c

@@ -0,0 +1,12 @@
+#include "case.h"
+
+void case_lowerb(char *s,unsigned int len)
+{
+  unsigned char x;
+  while (len > 0) {
+    --len;
+    x = *s - 'A';
+    if (x <= 'Z' - 'A') *s = x + 'a';
+    ++s;
+  }
+}