Uprev memcached from upstream

memcached 1.4.15 has some configuration errors:
configure:5798: error: cannot run test program while cross compiling

Uprev has the needed fix for the configuration error and some other fixes.

Signed-off-by: Amy Fong <amy.fong@windriver.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>