sqlcode.l: generate a reentrant scanner

 * put the global variables in struct sqlcodeYY_state.

 * globally define yyscanner and sqlcode_extra. these two should be per-thread.

 * add a new yyscan_t function parameter when these functions are referenced:
    - yyin, yyout, yyextra, yyleng, yytext, yylineno, yycolumn, and yy_flex_debug.
    - the macros BEGIN, YY_START, YYSTATE, yymore, unput, and yyless
    - the functions that deal with input buffers: yyrestart
    - others: yy_switch_to_buffer, yy_create_buffer, yy_delete_buffer,
                yy_flush_buffer, yypush_buffer_state, yypop_buffer_state,
                yy_scan_buffer, yy_scan_string, and yy_scan_bytes

 * add a new yyscan_t function parameter when globals are referenced,
   to get the yyextra out of the yyscanner.

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