[m-rev.] diff: fix mantis bug #506

[Zoltan Somogyi]

I have verified that extras/moose compiles with this diff.
There is no test case, since we don't have infrastructure
for testing the acceptability of .int3 files. (The two new
test directories valid_make_int and invalid_make_int are
for .int files, not .int3 files.)

We should consider at least building, and maybe testing,
the extras and the benchmarks as part of bootchecks.
Opinions?

Zoltan.
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