Add support for processing lex source files with flex v 2.6.3

	PR 21059
binutils* arlex.l: Support processing with flex 2.6.3.
	* deflex.l: Likewise.

gas	* config/bfin-lex.l: Support processing with flex 2.6.3.
	* itbl-lex.l: Likewise.
6 files changed