Windows build patch

[Mitchell, Neil]

Hi Claus,

> The ghc 6.8.3 perl probably shouldn't be on your PATH.

$ which perl
/usr/bin/perl

It isn't at the moment - perhaps some other things have changed in the
meantime which means its no longer required. However, I noticed that all
other invokations of perl follow the pattern of ./script, and this is
the only one that does perl script.

> Those times are gone, and 
> that line should probably be removed when you update the 
> guide (ghc should refer to the other executables in that 
> location directly, via relative paths, I think).

OK, will do.

Thanks

Neil

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