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on (void *) is not well defined.

8 bits masked out of a 32 bit int to individual bytes.

requiring an isc_region_t to fill in.  Use these macros in a few places.

can use internal buffer pointers without fear by first performing the
same validity check used in the buffer.c file.  This eliminates a
function call inside a loop, and the bufferlist.c file is really a
superset of buffers in many ways already.

isc_dynbuffer_allocate() and freed with isc_dynbuffer_free(), and are
a linkable buffer type with a built-in data area.