Document -optl-static

[Volker Stolz]

I think it would be a good idea to add -optl-static to the flags
described in
http://www.haskell.org/ghc/docs/latest/html/users_guide/options-phases.html#OPTIONS-LINKER
perhaps in the vincinity of -static & -dynamic. Although this could be considered
redundant, it might save some time trying out how to build entirely static
binaries. Opinions?
-- 
Volker Stolz * http://www-i2.informatik.rwth-aachen.de/stolz/ * PGP * S/MIME
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