[master] allow arbitrary-size rndc output

4005.	[func]		The buffer used for returning text from rndc
			commands is now dynamically resizable, allowing
			arbitrarily large amounts of text to be sent back
			to the client. (Prior to this change, it was
			possible for the output of "rndc tsig-list" to be
			truncated.) [RT #37731]

lib/isccc/include/isccc/cc.h

@@ -37,6 +37,7 @@
 /*! \file isccc/cc.h */
 
 #include <isc/lang.h>
+#include <isc/buffer.h>
 #include <isccc/types.h>
 
 ISC_LANG_BEGINDECLS
@@ -65,7 +66,7 @@ ISC_LANG_BEGINDECLS
 
 /*% Send to Wire */
 isc_result_t
-isccc_cc_towire(isccc_sexpr_t *alist, isccc_region_t *target,
+isccc_cc_towire(isccc_sexpr_t *alist, isc_buffer_t **buffer,
 		isc_uint32_t algorithm, isccc_region_t *secret);
 
 /*% Get From Wire */