intel: Fall back on glBitmap with fog enabled.

We would have to build the program with the appropriate fog mode, and
also supply the fog coordinate if appropriate.

Bug #19413.

src/mesa/drivers/dri/intel/intel_pixel_bitmap.c

@@ -411,6 +411,12 @@ intel_texture_bitmap(GLcontext * ctx,
       return GL_FALSE;
    }
 
+   if (ctx->Fog.Enabled) {
+      if (INTEL_DEBUG & DEBUG_FALLBACKS)
+	 fprintf(stderr, "glBitmap() fallback: fog\n");
+      return GL_FALSE;
+   }
+
    /* Check that we can load in a texture this big. */
    if (width > (1 << (ctx->Const.MaxTextureLevels - 1)) ||
        height > (1 << (ctx->Const.MaxTextureLevels - 1))) {