[DRE-maint] Bug#1075457: a patch for ruby-eb

[TODOROKI Shin-ichi]

Package: src:ruby-eb
Version: 2.6-4
Severity: important
Tags: sid trixie

Thank you very much for your valuable work on the maintenance.

I succeeded in rebuilding the ruby-eb deb package on trixie with the
following patch.
I hope this will help you all.  (Sorry for my amature report.)

$ diff eb.c eb.c.org
404,405c404
< /* reb_getsubbook(VALUE obj, VALUE sbook) */
< reb_getsubbook(VALUE obj)
---
> reb_getsubbook(VALUE obj, VALUE sbook)
1101c1100
<     rb_obj_id(robj);
---
>     rb_obj_taint(robj);
1372c1371
<     robj = rb_str_new(buffer, size);
---
>     robj = rb_tainted_str_new(buffer, size);
$ debuild -uc -us -b
...
$ ls ..
...
ruby-eb_2.6-4_amd64.deb
...
$