mesa: move location of some geometry program limits

The gl_program_constants struct is for limits that are applicable to
any/all shader stages.  Move the geometry shader-only fields into the
gl_constants struct.
Remove redundant MaxGeometryUniformComponents field too.

src/mesa/main/shaderapi.c

@@ -1732,7 +1732,7 @@ _mesa_ProgramParameteriARB(GLuint program, GLenum pname,
    switch (pname) {
    case GL_GEOMETRY_VERTICES_OUT_ARB:
       if (value < 1 ||
-          (unsigned) value > ctx->Const.GeometryProgram.MaxGeometryOutputVertices) {
+          (unsigned) value > ctx->Const.MaxGeometryOutputVertices) {
          _mesa_error(ctx, GL_INVALID_VALUE,
                      "glProgramParameteri(GL_GEOMETRY_VERTICES_OUT_ARB=%d",
                      value);