libiscsi 1.9.0

Closes #22371.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
plowshare 4.0

Closes #22274.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
v8: mark as needing lion or newer

Not compiling on Snow Leopard with or without Homebrew.
https://github.com/mxcl/homebrew/issues/21426
vim: needs hg for stable, for now
Add concat to BuildOptions
Give this a proper name
Move options to SoftwareSpec
Move dependencies to SoftwareSpec
guile: use spec deps
asciidoc: use spec deps
mobile-shell: use spec deps
xmp: use spec deps