Change link_alt_odb_entry() to take a NUL-terminated string instead of
(char *, len). Use string_list_split_in_place() rather than inline
code in link_alt_odb_entries().
This approach saves some code and also avoids the (probably harmless)
error of passing a non-NUL-terminated string to is_absolute_path().
Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Jeff King <peff@peff.net>