Bug#623462: ioquake3: uses jpeg_mem_src from the bundled libjpeg8

[Simon McVittie]

Package: ioquake3
Version: 1.36+svn1933-1
Severity: minor

Until Debian's SDL moves to libjpeg8, we can't either. However, we need some
of its functionality (previously provided by a patch). Until the libjpeg8
transition happens, we have a patch to use one file from the bundled
libjpeg8 (which works fine with libjpeg62, as it happens).

Blocked by: #547393