RTEMS | What is proper file header for code cherry picked from NetBSD? (#5334)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5334



## Summary

This issue is to answer the question of what attribution/copyright, license, and SPDX to add to files that were cherry picked from NetBSD. The following is a sample:

- ./cpukit/libdl/rtl-mdreloc-arm.c
- ./cpukit/libdl/rtl-mdreloc-i386.c
- ./cpukit/libdl/rtl-mdreloc-m68k.c
- ./cpukit/libdl/rtl-unwind-arm.c
- ./cpukit/libdl/rtl-unwind-arm.h
- ./cpukit/score/cpu/arm/include/machine/elf_machdep.h
- ./cpukit/score/cpu/i386/include/machine/elf_machdep.h
- ./cpukit/score/cpu/m68k/include/machine/elf_machdep.h
- ./cpukit/score/cpu/mips/include/machine/elf_machdep.h
- ./cpukit/score/cpu/moxie/include/machine/elf_machdep.h
- ./cpukit/score/cpu/nios2/include/machine/elf_machdep.h
- ./cpukit/score/cpu/powerpc/include/machine/elf_machdep.h
- ./cpukit/score/cpu/sparc/include/machine/elf_machdep.h
- ./cpukit/score/cpu/x86_64/include/machine/elf_machdep.h

The elf_machdep.h may be direct copies. This will have to be confirmed. But the recommendation at the end is the same. 

The libdl/rtl files are more challenging. This is typical of what is at the top of one of these files:

```
/*
 * Taken from NetBSD and stripped of the relocations not needed on RTEMS.
 */

/*	$NetBSD: mdreloc.c,v 1.26 2010/01/14 11:58:32 skrll Exp $	*/
```

@chris and I chatted a bit about this and he asked for a proposal Unfortunately, I think we do need to go back to the NetBSD source for each file to ensure we pick the right BSD license tag. For the above file which is rtl-reloc-arm.c in RTEMS libdl, it is libexec/ld.elf_so/arch/m68k/mdreloc.c in NetBSD. The current [version](https://github.com/NetBSD/src/blob/54994cf764b063801ddcb0afb35b358a8ad403ef/libexec/ld.elf_so/arch/m68k/mdreloc.c#L2) has had multiple updates but it is currently Four Paragraph BSD and has the following attribution:

```
 * Copyright 1996 John D. Polstra.
 * Copyright 1996 Matt Thomas <matt at 3am-software.com>
 * All rights reserved.
```

My suggestion requires git archaeology on the NetBSD source but it seems the right thing to do.

1. Find the current NetBSD source for each file.
2. Copy the license/copyright block into the RTEMS version.
3. Add SPDX for the license used as line 1 of the RTEMS file
4. Add a Doxygen file block which includes the CVS Id and the comment about RTEMS changes. If there are no RTEMS changes, we probably should add a note to that effect.

Rinse and repeat for each file from NetBSD.

### Pre-set options

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