license-checker-tool: handle word wraps / ignore `-\n`

[quantenzitrone]

example license from https://gitlab.freedesktop.org/xorg/lib/libxres/-/blob/460d11002d20683420fdb0d09ab3c7a0cccd74f4/COPYING

Copyright (c) 2002  XFree86 Inc
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is fur-
nished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FIT-
NESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CON-
NECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the XFree86 Project shall not
be used in advertising or otherwise to promote the sale, use or other deal-
ings in this Software without prior written authorization from the XFree86
Project.

it includes several word wraps which split words between lines with -

i suggest the license checker tool should recognize this to better match licenses like that

[goneall]

@quantenzitrone good point - I'm surprised we haven't run into this until now. We'll need to update the SPDX license matching guidelines first - I'll open an issue.

I'm also going to move this to the SPDX Java library which implements the license matching used in this online tool.

In terms of implementation, I think we need to "unwrap" the line by removing the -\n and concatenating the following token - a bit more work but entirely possible.

[goneall]

Update: It looks like the SPDX legal team agrees with the proposal - the next step is to update the SPDX matching guidelines.

[bact]

Proposed guideline text at
spdx/license-list-XML#2823 (comment)