GLSL 1.30 allows int and ivecN types to be passed to the functions
abs, sign, min, max, and clamp.  In addition, it adds new unsigned
integer types uint and uvecN, which may be passed to min, max, clamp,
lessThan, lessThanEqual, greaterThan, greaterThanEqual, equal,
notEqual, and built-in operators.

This patch adds auto-generated tests for all of these new integral
built-in functions and operations.

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