Replace two deprecated parser generator directives

There is a conflict between Flex's bison-bridge and Bison's api.prefix
options.  Apparently, the former was added without consulting the Bison
devs and requires YYSTYPE, which is not added to the header anymore by
the latter.  Instead, we just provide the proper definition of yyflex()
manually (as recommended by the Bison docs), so the option is not
required anymore.

src/libstrongswan/settings/settings_lexer.l

@@ -37,8 +37,8 @@ static void include_files(parser_helper_t *ctx);
 /* due to that disable interactive mode, which requires isatty() */
 %option never-interactive
 
-/* don't use global variables, and interact properly with bison */
-%option reentrant bison-bridge
+/* don't use global variables */
+%option reentrant
 
 /* maintain the line number */
 %option yylineno

src/libstrongswan/settings/settings_parser.y

@@ -55,20 +55,27 @@ static void add_references(parser_helper_t *ctx, array_t *references);
  * Make sure to call lexer with the proper context
  */
 #undef yylex
-static int yylex(YYSTYPE *lvalp, parser_helper_t *ctx)
+static int yylex(SETTINGS_PARSER_STYPE *yylval, parser_helper_t *ctx)
 {
-	return settings_parser_lex(lvalp, ctx->scanner);
+	return settings_parser_lex(yylval, ctx->scanner);
 }
 
 %}
 %debug
 
 /* generate verbose error messages */
-%error-verbose
+%define parse.error verbose
 /* generate a reentrant parser */
 %define api.pure
 /* prefix function/variable declarations */
-%name-prefix "settings_parser_"
+%define api.prefix {settings_parser_}
+/* make sure flex uses the right definition */
+%code provides
+{
+	#define YY_DECL \
+		int settings_parser_lex(SETTINGS_PARSER_STYPE *yylval, void *yyscanner)
+	YY_DECL;
+}
 
 /* interact properly with the reentrant lexer */
 %lex-param {parser_helper_t *ctx}

src/starter/parser/lexer.l

@@ -38,8 +38,8 @@ static void include_files(parser_helper_t *ctx);
 /* due to that disable interactive mode, which requires isatty() */
 %option never-interactive
 
-/* don't use global variables, and interact properly with bison */
-%option reentrant bison-bridge
+/* don't use global variables */
+%option reentrant
 
 /* maintain the line number */
 %option yylineno

src/starter/parser/parser.y

@@ -48,20 +48,27 @@ static void conf_parser_error(parser_helper_t *ctx, const char *s);
  * Make sure to call lexer with the proper context
  */
 #undef yylex
-static int yylex(YYSTYPE *lvalp, parser_helper_t *ctx)
+static int yylex(CONF_PARSER_STYPE *yylval, parser_helper_t *ctx)
 {
-	return conf_parser_lex(lvalp, ctx->scanner);
+	return conf_parser_lex(yylval, ctx->scanner);
 }
 
 %}
 %debug
 
 /* generate verbose error messages */
-%error-verbose
+%define parse.error verbose
 /* generate a reentrant parser */
 %define api.pure
 /* prefix function/variable declarations */
-%name-prefix "conf_parser_"
+%define api.prefix {conf_parser_}
+/* make sure flex uses the right definition */
+%code provides
+{
+	#define YY_DECL \
+		int conf_parser_lex(CONF_PARSER_STYPE *yylval, void *yyscanner)
+	YY_DECL;
+}
 
 /* interact properly with the reentrant lexer */
 %lex-param {parser_helper_t *ctx}