RC1 build failures on Debian

[Nikita Karetnikov]

> In file included from rts/sm/Evac.c:21:0:
> rts/sm/GCTDecl.h:139:2: error: #error Cannot find a way to declare the thread-local gc variable!
>  #error Cannot find a way to declare the thread-local gc variable!
>   ^

I built GHC from the source tarball on mips64el and hit the same error.
Any suggestions?

Funnily, the comment in the corresponding file says

/* Impossible! */
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