Mark test for #8831 as known-broken
Mark test for #8831 as known-broken

to keep validate working.

(cherry picked from commit 4bc3c8265f988f4456664f502164f52466aab67d)

Conflicts:
	testsuite/tests/ghci/scripts/all.T

hferreiro/replay,hferreiro/replay,lukexi/ghc-7.8-arm64,lukexi/ghc-7.8-arm64,hferreiro/replay,hferreiro/replay,hferreiro/replay,lukexi/ghc-7.8-arm64,hferreiro/replay,hferreiro/replay,lukexi/ghc-7.8-arm64,lukexi/ghc-7.8-arm64