Update from 2.6.0 to 2.6.2.

Feature safe: yes

<ChangeLog>

[ Redis 2.6.2 ]

• [BUGFIX] The compilation fix for RHLE5 in 2.6.1 was broken. Fixed.
• [IMPROVED] Linenoise updated, now supports Ctrl+w.

[ Redis 2.6.1 ]

• [BUGFIX] Compilation on Linux < 2.6.17 or glibc < 2.6 fixed (RHLE5 & co).

</ChangeLog>