Fix (last) compiler warnings

storage/innobase/pars/lexyy.c:
  Fix compiler warnings (fix is also in pars0lex.l)
support-files/compiler_warnings.supp:
  Extra safety to ensure we really get rid of warning :)

storage/innobase/pars/lexyy.c

@@ -1017,7 +1017,7 @@ YY_RULE_SETUP
 			yylval = sym_tab_add_bound_lit(pars_sym_tab_global,
 				yytext + 1, &type);
 
-			return(type);
+			return((int) type);
 }
 	YY_BREAK
 case 4:

support-files/compiler_warnings.supp

@@ -19,6 +19,7 @@ sql_yacc.cc : .*switch statement contains 'default' but no 'case' labels.*
 #
 pars0grm.tab.c: .*'yyerrorlab' : unreferenced label.*
 _flex_tmp.c: .*not enough actual parameters for macro 'yywrap'.*
+pars0lex.l: .*conversion from 'ulint' to 'int', possible loss of data.*
 
 #
 # bdb is not critical to keep up to date