EXT-4340: Fixed llviewerhelputil_test.cpp on Linux.
EXT-4340: Fixed llviewerhelputil_test.cpp on Linux.

The gcc compiler will strip out the stubbed isGodlike() method under
an optimized build. There's no way to stop this without either putting
the definition in another cpp file, which is hard to do with our unit
test infrastructure, or disabling gcc's inlining of the method. So I
did the latter, using __attribute__ ((noinline).

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