glsl-es-1.00: declare some functions that are not builtins in 1.00

Background of this test is that some Android games define these
functions as they are not supposed to exist in GLSL ES 1.00.

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <mesa/piglit!382>