GLSL 1.30 added support for the following new built-in functions:
sinh, cosh, tanh, asinh, acosh, atanh, round, roundEven, trunc, modf,
isnan, and isinf.

This patch adds tests for all of the new built-in functions except
modf, isnan, and isinf.  modf will need to be tested separately
because it has an out parameter; isnan and isinf will need to be
tested separately because producing infinite and NaN values will
require extra work in the shader.

Reviewed-by: Chad Versace <chad@chad-versace.us>