lima/gpir: eq and ne support

[enunes]

Tested on A20 Mali400 with gbm-surface and the following shaders:

eq:

attribute vec3 positionIn;
void main()
{
    vec3 myvar = positionIn;
    if (positionIn.x == 1.0)
        myvar.y = 0.5;
    gl_Position = vec4(myvar, 1);
}

ne:

attribute vec3 positionIn;
void main()
{
    vec3 myvar = positionIn;
    if (positionIn.x != 1.0)
        myvar.y = 0.5;
    gl_Position = vec4(myvar, 1);
}

and:

attribute vec3 positionIn;
void main()
{
    vec3 myvar = positionIn;
    if ((positionIn.x == 1.0) && (positionIn.y == 1.0))
        myvar.y = 0.5;
    gl_Position = vec4(myvar, 1);
}

or:

attribute vec3 positionIn;
void main()
{
    vec3 myvar = positionIn;
    if ((positionIn.x == 1.0) || (positionIn.y == 1.0))
        myvar.y = 0.5;
    gl_Position = vec4(myvar, 1);
}