encoding/xml: replace comments inside directives with a space
Backport from a9cfd55e2b
(From OE-Core rev: 76d855f3d2c250ac85ca6f24bf0e178fb32607f9)
Signed-off-by: Shubham Kulkarni <skulkarni@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>