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mplicit conversions correctly.

Perhaps we should add some implicit conversions tests in the piglit glsl2 s=
ection. The glsl-const-builtin tests appear to target testing builtin funct=
ions and not intended to test implicit conversions. I think that there is s=
ome value in getting tests running on as many platforms as possible for com=
parison.

Since the original tests are correct please feel free to revert the commit =
too.