RTEMS | wscript: Make builds with tar archives reproducible (!405)

[Frank Kuehndel (@frank_k)]

Frank Kuehndel created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/405

Project:Branches: frank_k/rtems:fk-wscript-reproducible to rtems/rtos/rtems:main
Author:   Frank Kuehndel




## Summary

Make produced executables binary identical even when the user's `umask` differs.

The `umask` (file read/write/executable permissions for user, group and others) affect binaries like the test `testsuites/libtests/dl01.exe` as it contains a `tar`-archive in the executable.

This MR has been tested with SPARC/gr740 SMP. `umask` 077 and 022. RSB 7 `f1078f1607354b62e4707ce9ea720028fdffd00a`.

The patch is actually from Sebastian.

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