Support hexadecimal numbers

src/lsc/lexer.l

@@ -105,6 +105,8 @@ return		return TOKRETURN;
 
 [0-9]+          yylval.Tinteger = atoi(yytext); return NUMBER;
 -[0-9]+         yylval.Tinteger = atoi(yytext); return NUMBER;
+0x[0-9]+        yylval.Tinteger = strtol(yytext+2, (char **)NULL, 16); return NUMBER;
+-0x[0-9]+       yylval.Tinteger = strtol(yytext+2, (char **)NULL, 16); return NUMBER;
 [0-9]+\.[0-9]+	yylval.Treal = atof(yytext); return REAL;
 -[0-9]+\.[0-9]+	yylval.Treal = atof(yytext); return REAL;
 [_a-zA-Z0-9]+	yylval.Tstring = strdup(yytext); return IDENTIFIER;