LO build fails -Werror=stringop-truncation in _lex.c

[julien2412]

Reading
https://randomascii.wordpress.com/2013/04/03/stop-using-strncpy-already/, it
seems we should really avoid strncpy.
Considering
https://opengrok.libreoffice.org/search?project=core&q=strncpy&defs=&refs=&path=&hist=&type=,
there's some work for this.



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