package/nginx: bump version to 1.15.12

The license file hash has been modified due to copyright year updates:

- * Copyright (C) 2002-2018 Igor Sysoev
- * Copyright (C) 2011-2018 Nginx, Inc.
+ * Copyright (C) 2002-2019 Igor Sysoev
+ * Copyright (C) 2011-2019 Nginx, Inc.

Signed-off-by: Adam Duskett <Aduskett@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
3 files changed