Stage1Only

[Trevor Elliott]

> In retrospect I should have used a different name.  Feel free to fix it
> (and the wiki page).

I've created a ticket with a patch that I think addresses this issue 
[1].  The patch adds a mechanism that allows packages and programs to be 
disabled when building with a specific stage of GHC.  It also adds a 
default set of disabled packages when Stage1Only is set.

A side effect of this change is that no package adds an RTS dependency 
when Stage1Only is enabled, so I've also added all_rts to the all target 
in rts/ghc.mk.  I wasn't able to figure out where the dependency on the 
all_rts target comes from, so if that change doesn't make sense I'm 
happy to modify the attached patch :)

--trevor

[1] http://hackage.haskell.org/trac/ghc/ticket/7841

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