Fixes CVE-2017-2888 - An exploitable integer overflow vulnerability exists
when creating a new RGB Surface in SDL 2.0.5. A specially crafted file can
cause an integer overflow resulting in too little memory being allocated
which can lead to a buffer overflow and potential code execution. An
attacker can provide a specially crafted image file to trigger this
vulnerability.
Also add a hash for the license file while we're at it.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
07a9f0200c