[v2.4] Multiple Vulnerabilities in libexif < 0.6.21 may allow remote code execution

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2812
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2813
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2814
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2836
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2837
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2840
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-2841

- Upgrade to 0.6.21

(from redmine: issue id 1259, created on 2012-07-19, closed on 2012-08-02)

Changesets:
- Revision b8e5bb1c by Natanael Copa on 2012-07-25T09:33:09Z:

main/libexif: security upgrade to 0.6.21 (CVE-2012-2812,CVE-2012-2813,CVE-2012-2814,CVE-2012-2836,CVE-2012-2837,CVE-2012-2840,CVE-2012-2841)

fixes #1259

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