RFC: setup.ini change

[Charles Wilson]

Oh yeah -- speaking of changes to setup.ini:

Chris, can we get that "external-src: other-pkg-name" thing into upset? 
    (or "other-src" or whatever) Reminder:

setup.hint (for libncurses6)
sdesc: ----
ldesc: ----
requires: cygwin terminfo
external-src: ncurses

setup.ini
@ libncurses6 @
sdesc: ----
ldesc: ----
requires: cygwin terminfo
install: release/ncurses/libncurses6/libncurses6-5.2-8.tar.bz2 ...
source: release/ncurses/ncurses-5.2-8-src.tar.bz2 ...
[prev]
install: release/ncurses/libncurses6/libncurses6-5.2-7.tar.bz2 ...
source: release/ncurses/ncurses-5.2-7-src.tar.bz2 ...

That is, when it sees "external-src" it hunts for the -src package of 
the specified package, with the version matching the pendant package, 
and uses that.

--Chuck