Fix segfault when involing "lex" without specify the output "-o" and …#2

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Commits on Jul 31, 2022

Fix segfault when involing "lex" without specify the output "-o" and make it work as specified in the "lex.1" man page
mingodad
committed
Add the actual quantity when the error was generated and small output layout change
mingodad
committed
Initial implementation of "%option case-insensitive"
mingodad
committed