glsl: Allow the use of determinant() in GLSL 1.50.

We already implemented this for ES3, so we just need to turn it on.

Fixes 6 Piglit tests:
spec/glsl-1.50/compiler/built-in-functions/determinant-mat[234].{vert,frag}

Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>

src/glsl/builtins/profiles/150.glsl

@@ -383,6 +383,10 @@ mat4x2 transpose(mat2x4 m);
 mat3x4 transpose(mat4x3 m);
 mat4x3 transpose(mat3x4 m);
 
+float determinant(mat2 m);
+float determinant(mat3 m);
+float determinant(mat4 m);
+
 mat2 inverse(mat2 m);
 mat3 inverse(mat3 m);
 mat4 inverse(mat4 m);