write command line switches into lex.yy.c

[chriskuku]

flex 2.6.4, macOS 11.7.10 here.

It would be nice to write the command line by which flex was invoked into the lex.yy.c file, so that one can see whether it was invoked with -l and or -8 and what else.

Not an issue but a suggestion for a miniscule improvement. Thank you.