Length of the longest attribute name in this program, including the null byte

Property definitions

glesv2 $ GLProgram :: active_attribute_max_length
	# Length of the longest attribute name in this program, including the null byte
	fun active_attribute_max_length: Int do return glGetProgramiv(self, gl_ACTIVE_ATTRIBUTE_MAX_LENGTH)
lib/glesv2/glesv2.nit:104,2--105,100