Fix using post-init shader array constructors

[Chaosus]

Currently, its impossible to use post-initialized array constructors like:

void fragment() {
  float t[3];
  t = float[3](0.0, 1.0, 0.0); // ERROR
}

or

varying float v[3];

void vertex() {
	v = {0.0, 1.0, 0.0}; // ERROR
}

So, I've fixed it and now it's possible (GLSL support it)