[FS#711] iptables 600-shared-libext.patch broken and incomplete

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Nathaniel Wesley Filardo (nwf) 

Attached to Project - LEDE Project
Summary - iptables 600-shared-libext.patch broken and incomplete
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Building LEDE HEAD (but, I think, anything after 5e2d15b4a6fc979497b252c617c4b353d6c84fa2) fails with various and exciting errors if IPTABLES_NFTABLES is turned on.

For starters, 600-shared-libext.patch erroneously changes ${libext_ebt_objs} to ${libext_ebt__objs} and similarly for ${libext_arpt_objs}, resulting in missing .o files and a subsequent link failure.  Fixing that, however, reveals that the xtables-compat-multi dependencies are still referring to .a files, not the .so-s that actually get built.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=711