[LTP] [PATCH 0/2 v2] Add SPDX in Makefile and use tabs instead of spaces

[Petr Vorel]

Hi Ziyao,

> v1->v2:
> 1. Fix errors in patch application;
> 2. Add unrelated changes in replacing spaces with tabs into a separate patch.

> Xie Ziyao (2):
>   Makefile: Use SPDX in Makefile
>   open_posix_testsuite/Makefile: Use tabs instead of spaces
FYI although safe to merge, we postpone merging after the release.
Thanks!

Kind regards,
Petr