Add function to count number of unpacked varying vectors #50
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This counts the number of vectors used by each active varying in a
shader. This can be used to ensure that a shader will succesfully
compile without using more than GL_MAX_VARYING_VECTORS on devices that
do not perform spec-compliant packing of varyings. This is in contrast
to sh::CheckVariablesWithinPackingLimits(), which checks whether there
are enough vectors with spec-compliant packing.