Adding 5.5 support, removing 5.3 support

(Portage version: 2.1.12.2/cvs/Linux x86_64, signed Manifest commit with key C4A92BF5)
bump; rm 1 test wrt Bug #474874, usual upgrade of deps

(Portage version: 2.1.11.63/cvs/Linux x86_64, signed Manifest commit with key 0xB8072B0D)
m68k stable wrt #470580

(Portage version: 2.2.0_alpha188/cvs/Linux x86_64, signed Manifest commit with key 4868F14D)
old

(Portage version: 2.2.0_alpha188/cvs/Linux x86_64, signed Manifest commit with key 4868F14D)
Stabilize for everyone.

(Portage version: 2.2.0_alpha188/cvs/Linux x86_64, signed Manifest commit with key 4868F14D)
m68k stable wrt #470580

(Portage version: 2.2.0_alpha188/cvs/Linux x86_64, signed Manifest commit with key 4868F14D)
old

(Portage version: 2.2.0_alpha188/cvs/Linux x86_64, signed Manifest commit with key 4868F14D)
Fix configure phase. NPTL is not a user-configurable feature anymore.

(Portage version: 2.2.0_alpha189_p3/cvs/Linux x86_64, signed Manifest commit with key 611FF3AA)