glsl: Switch from the deprecated YYLEX_PARAM to %lex-param.

YYLEX_PARAM is no longer supported as of Bison 3.0.  Instead, the Bison
developers recommend using %lex-param.

%lex-param takes a type and variable name, similar to %parse-param,
so you can't pass an arbitrary expression like state->scanner.  But Flex
insists on passing the actual scanner object, not an arbitrary object
like state.

To solve this, the parser defines a wrapper lex() function which accepts
"state," and calls Flex's lex() function with state->scanner.

Fixes the build with Bison 3.0.  Also works with Bison 2.7.1.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=67354
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Tested-by: Laurent Carlier <[email protected]>
Cc: "9.2" [email protected]

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