v2.6.6 - fixes for ARM 64-bit builds and reconnecting after PLC outages

[Kyle]

Many thanks, again, to @wegel for finding a problem with reconnection and providing a fix and test!  Contents of this release:

• fixes for ARM 64-bit builds as reported by user @chanhowcheng.
• fixes for reconnecting to a PLC after an outage as reported by @wegel and @mikecflood.  @wegel proposed a nice PR with some fixes and a good test program.  I ended up solving this in a different way to also include fixing non-auto sync tags and expanded the test program.  Thanks!
• Fix base glibc version on Debian/Ubuntu systems.  User "2gd4who" found this.  I backleveled the build systems to use Ubuntu 22.04 instead of 24.04 and the glibc version problem seems to be fixed.   Debian does not have the latest glibc version yet.

Thanks for using libplctag!  Find the release here.

Best,

Kyle