[Piglit] More JSON problems. :(

[Ian Romanick]

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I was trying to test Paul's recent GLSL tests on AMD's closed-source
driver, and I encountered some difficulties that were unrelated to those
tests.  A couple tests, one of the FBO tests if I recall correctly,
generate output on failing runs that is not valid UTF-8.  Somewhere deep
in the JSON writer, it gets really angry (and throws an exception) when
it receives the illegal UTF-8 bits.  As soon as that happens, the whole
test run aborts.

I'm not sure what the solution is, but we need to find one.
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