syscfg: Add lock-obj-pub files for {armv5, armv6, x86_64}-musl targets

* src/syscfg/lock-obj-pub.armv5-unknown-linux-musleabi.h: New.
* src/syscfg/lock-obj-pub.armv6-unknown-linux-musleabihf.h New.
* src/syscfg/lock-obj-pub.x86_64-pc-linux-musl.h: New.
* src/Makefile.am (lock_obj_pub): Add files.

This patch adds three new precompiled lock-obj-pub files:

• armv5-unknown-linux-musleabi
• armv6-unknown-linux-musleabihf
• x86_64-pc-linux-musl

ChangeLog lines and Makefile patch by -wk