syscfg 20260724

NEWS:
* Makefile variables $BIN_INSTALL, $MAN1_INSTALL, $INS, $BIN_FLAGS, and
  $MAN_FLAGS have been removed. Technically a breaking change, and is therefore
  marked as one.
  Breaking (backward-incompatible) change.

* Synced shell-glossary to release 20260723. For more information, refer to
  the corresponding documentation.

- Filtered log of core changes:
65de4d5 syscfg: `.` char instead of `x` at CS EOF
f54d317 .gitmodules: shell-glossary -> `20260723`
75b4cce syscfg: Improve Makefile/build

- Complete log between 20260628 and 20260724:
bfb2568 syscfg 20260724
65de4d5 syscfg: `.` char instead of `x` at CS EOF
f54d317 .gitmodules: shell-glossary -> `20260723`
f78dd3b syscfg: [fmt] more consistent help text readability
75b4cce syscfg: Improve Makefile/build
20374ae Makefile: Cleanup useless variables