afl-fuzz 0.85b (new formula)

Closes #34680.
afl-fuzz: add 0.85b bottle.
afl-fuzz: tweak test.
Update libbpg to 0.9.1

The author has thankfully included some of the inreplace Makefile
fixes in the upstream 0.9.1 release's Makefile.
libbpg: add 0.9.1 bottle.