Use flex -i when building with meson.

When built with automake, the assembler's tokeniser is built with -i,
making it case-insensitive. This wasn't being done with meson.

(The symptom was build failures in intel-vaapi-driver, which uses
register types like ":ub". In lex.l, they're written as ":UB", so the
lexer was rejecting them without -i.)

Signed-off-by: Adam Sampson <ats@offog.org>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>

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