bug#49344: shr: Add support for "data-src" attribute in <img> nodes

[杨英超]

Dear maintainers:

I found eww fails to show card-images which is described in the following web page:

https://www.geeksforgeeks.org/why-card-images-use-data-src-not-src-for-image-in-bootstrap-4/

For example, if you open following page with eww & firefox, you will notice the differences:   http://www.interdb.jp/pg/pgsql05.html

I modified shr.el a little bit to support "data-src" attribute, so eww can display card-images properly.

 Hope it helps.

Regards

yc

0001-Add-support-for-data-src-attribute-in-img-tag.patch
Description: Text Data