emulators/qemu-devel: Update version 2.4.0=>2.5.0

• Remove nox@ from MASTER_SITES (R.I.P. nox)
• Take MAINTAINERSHIP
• Add LICENSE (GPLv2)
• Convert to OPTIONSNG
• Fix patch files to be 'make makepatch' compatible
• Fix Multiple Security Vulnerabilities [1]

PR: 203112 [1]
Submitted by: venture37@geeklan.co.uk [1]
Security: CVE-2015-5165 [1]

		CVE-2015-5745 [1]
		CVE-2015-5154 [1]
		CVE-2015-5225 [1]

Differential Revision: https://reviews.freebsd.org/D3691