Skip the trigraph test under OpenBSD i386

OpenBSD 6 produces position-independent executables (PIE) by default,
warns when the text segment of a PIE contains relocations
("warning: creating a DT_TEXTREL in a shared object"),
and has no gcc option to turn the warning off.

ocamlopt on i368 produces code that needs relocation, and therefore
triggers the warning every time.

This causes a false alarm in the trigraph.ml test, where we check
that compilation produces nothing on stdout nor stderr.

As a temporary workaround, we skip the trigraph.ml test under
OpenBSD i386.

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