[SECURITY] glibc official releases

[mancha@mac.hush.com]

Hi. Both official releases 2.15 and 2.15 were signed with pgp key 0x6C2A4AFF
(fingerprint: F37C DAB7 08E6 5EA1 83FD 1AF6 25EF 0A43 6C2A 4AFF).

However, the key's owner, Carlos O'Donnel, is the only signatory. In order for
this key to have a greater degree of legitimacy as an official signing key it
should be signed by other glibc and GNU developers.

Thank you for your attention to this request.