mesa: Fix glTexCoordPointer with type GL_FIXED.

GL_FIXED is also a legal type for glTexCoordPointer.
diff --git a/src/mesa/main/varray.c b/src/mesa/main/varray.c
index 340c3fe..2728b38 100644
--- a/src/mesa/main/varray.c
+++ b/src/mesa/main/varray.c
@@ -297,7 +297,8 @@
                       const GLvoid *ptr)
 {
    GLbitfield legalTypes = (SHORT_BIT | INT_BIT |
-                            HALF_BIT | FLOAT_BIT | DOUBLE_BIT);
+                            HALF_BIT | FLOAT_BIT | DOUBLE_BIT |
+                            FIXED_BIT);
    GET_CURRENT_CONTEXT(ctx);
    const GLuint unit = ctx->Array.ActiveTexture;
    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);