toolchain-shar-relocate.sh: Fix handling files with colons

Files could contain colons in name and we should not use
colons (':') as field separator. E.g. perl/python man
pages packages.

Signed-off-by: Oleksiy Obitotskyy <oobitots@cisco.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>