Create a new fragment shader

The newly created instance should be checked using is_ok.

Property definitions

glesv2 $ GLFragmentShader :: new
	# Create a new fragment shader
	#
	# The newly created instance should be checked using `is_ok`.
	new `{ return glCreateShader(GL_FRAGMENT_SHADER); `}
lib/glesv2/glesv2.nit:327,2--330,53