[m-rev.] diff: fix mantis bug 368

[Zoltan Somogyi]

I tried to make the test case invoke the compiler with --erlang even when
the bootcheck is in a different grade, but that doesn't fit into our current setup.

I tested it manually, and the new test case gets a compiler error without
this fix, but not with this fix. However, since I don't have Erlang installed,
I cannot test the fix fully. Peter, will you try it out?

Zoltan.
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