[PATCH 21.5] Another valgrind complaint about memcpy

[Jerry James]

PATCH 21.5

This fixes the only other complaint I'm getting from valgrind about
something of the form memcpy(&x, &x, sizeof(x));.  Twice in the
redisplay code, we try to optimize by building a dynarray entry in
place, then throw it all away by doing Dynarr_add, which copies the
bytes from where they are to ... um, where they are.  The fix is to
use Dynarr_increment in that case instead to bump up the size of the
dynarray to include the new entry.  I have run with this for a couple
of hours today, but have not given it extensive testing.
-- 
Jerry James
http://loganjerry.googlepages.com/
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