unistr/u16-to-u32: Relicense under LGPLv2+

[Bruno Haible]

I need a few libunistring modules under LGPLv2+:
  lib/unistr/u16-to-u32.c
  lib/unistr/u16-mbtoucr.c
  lib/unistr/u16-strlen.c
Since I am the only contributor of copyright-significant changes to these files,
I can do the license change directly.


2024-03-09  Bruno Haible  <bruno@clisp.org>

        unistr/u16-to-u32: Relicense under LGPLv2+.
        * modules/unistr/u16-to-u32 (License): Change to LGPLv2+.
        * lib/unistr/u16-to-u32.c: Update license notice.

        unistr/u16-mbtoucr: Relicense under LGPLv2+.
        * modules/unistr/u16-mbtoucr (License): Change to LGPLv2+.
        * lib/unistr/u16-mbtoucr.c: Update license notice.

        unistr/u16-strlen: Relicense under LGPLv2+.
        * modules/unistr/u16-strlen (License): Change to LGPLv2+.
        * lib/unistr/u16-strlen.c: Update license notice.

0001-unistr-u16-strlen-Relicense-under-LGPLv2.patch
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0002-unistr-u16-mbtoucr-Relicense-under-LGPLv2.patch
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0003-unistr-u16-to-u32-Relicense-under-LGPLv2.patch
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