Enable utf8, add mb funcs from ndk support

Change-Id: Ib80ee94d0dad6bf91df780c43fdce6694a4e3d19
Signed-off-by: Tanguy Pruvot <tanguy.pruvot@gmail.com>
update to 2.2.6 (from svn 2.2 branch)

Change-Id: I016f3ffb3564fc79184bddd173135ab2156f9252