Fix for GHC testsuite

[thomie]

For better or worse, random is part of the GHC testsuite. Please merge this one line change to tests/all.T.

It fixes the following problem that SPJ had, when he wrote to the ghc-devs mailinglist:

I’m getting this collection of failing tests, all of a sudden (below).  What’s up?  I’m pretty sure it’s not my modifications.

The failures are



=====> random1283(normal) 1 of 1 [0, 0, 0]

cd . &&  "/5playpen/simonpj/HEAD-4/inplace/test   spaces/ghc-stage2" -o random1283 random1283.hs -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-db -rtsopts -fno-warn-tabs -fno-warn-missed-specialisations -fno-ghci-history   -package containers > random1283.comp.stderr 2>&1

Compile failed (status 256) errors were:

[1 of 1] Compiling Main             ( random1283.hs, random1283.o )
...