Suggest that 'ExitFailure 9' is probably due to memory exhaustion.

Fixes #1522.

Example of output:

```
[...]
[ 5 of 41] Compiling Data.Text.Fusion.Internal ( Data/Text/Fusion/Internal.hs, dist/dist-sandbox-3688fbc2/build/Data/Text/Fusion/Internal.o )
[ 6 of 41] Compiling Data.Text.Fusion.CaseMapping ( Data/Text/Fusion/CaseMapping.hs, dist/dist-sandbox-3688fbc2/build/Data/Text/Fusion/CaseMapping.o )
Failed to install text-0.11.3.1
cabal: Error: some packages failed to install:
text-0.11.3.1 failed during the building phase. The exception was:
ExitFailure 9
This may be due to an out-of-memory condition.
```