ispell: move non-libs into subdirectory
pypy: now with setuptools 1.0
jenkins 1.528

Closes #22054.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
isl: move gdb script to gdb auto-load directory

This is where e.g. glib puts similar scripts; potentially gdb from
homebrew-versions needs to be configured to look here instead of in its
keg, but I'm not an expert.
Redis 2.6.15

Closes #22046.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
boost: no need for backported patches on HEAD

Closes #22055.

Signed-off-by: Xiyue Deng <manphiz@gmail.com>
rtmpdump: use newer version that debian packages

Closes #22045.
Demonstrate the Set-like nature of Options collections

Options collections are backed by Sets, and thus trying to push a new
option with a name that duplicates an existing option cannot succeed.

Later, we can exploit this behavior and remove some conditionals.
Options: ensure copies do not share the underlying collection