mail/postfixadmin: unbreak build with php80

Drop abandonware xmlrpc dependency with php80

PHP80 was introduced more than two month ago,
maintainer had more than enough time to react and fix the port

With hat:	ports-secteam

mail/postfixadmin/Makefile

@@ -37,12 +37,18 @@ OPTIONS_DEFAULT=	PGSQL
 
 USE_PERL5=	run
 
-USE_PHP=	mbstring openssl pcre phar session spl xmlrpc
+USE_PHP=	mbstring openssl pcre phar session spl
 
 MYSQL_USE=	php=mysqli
 PGSQL_USE=	php=pgsql
 SQLITE_USE=	php=sqlite3
 
+.include <bsd.port.options.mk>
+
+.if ${FLAVOR} != php80
+USE_PHP_=	xmlrpc
+.endif
+
 do-install:
 	@${MKDIR} ${STAGEDIR}${WWWDIR}
 	@${MKDIR} ${STAGEDIR}${WWWDIR}/templates_c