ell: upgrade 0.63 -> 0.64

Changelog:
==========
-Fix issue with casting in C++ environment.
-Fix issue with ASCII string upper and lower helpers.

(From OE-Core rev: 29e3e0eb9b69f966a319810270fb668e4fce9389)

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit a28405da8dad7e6222d7badaa3eda175e3df32c9)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-core/ell/ell_0.63.bb → meta/recipes-core/ell/ell_0.64.bb

@@ -15,7 +15,7 @@ DEPENDS = "dbus"
 inherit autotools pkgconfig
 
 SRC_URI = "https://mirrors.edge.kernel.org/pub/linux/libs/${BPN}/${BPN}-${PV}.tar.xz"
-SRC_URI[sha256sum] = "7397c76996d7646b9917ebf016cd67586b10166295af2e0e18cdb5b8f6659965"
+SRC_URI[sha256sum] = "760f3901078409f66cadf1bb24c8bdc60f13d53f6dd66b88631221d2494f8405"
 
 do_configure:prepend () {
     mkdir -p ${S}/build-aux