Enable FD passing and thus building of the UI-server.

* configure.ac: Make --enable-fd-passing the default.
* src/engine-uiserver.c (_gpgme_engine_ops_uiserver): Syntax fix.

NEWS

@@ -1,6 +1,23 @@
 Noteworthy changes in version 1.4.0 (unreleased)
 ------------------------------------------------
 
+ * New function gpgme_set_global_flag to help debugging on Android.
+
+ * New function gpgme_io_writen as a convenience wrapper around
+   gpgme_io_write.
+
+ * New functions to support the pinentry mode feature of GnuPG 2.1.
+
+ * New macro GPGME_VERSION_NUMBER to allow supporting different API
+   versions without the need for a configure test.
+
+ * Several improvements for gpgme-tool.
+
+ * Better logging of the common "invalid engine" error code.
+
+ * Support for FD passing is now enabled by default.  The configure
+   option --disable-fd-passing may be used to disable this.
+
  * Interface changes relative to the 1.3.1 release:
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  GPGME_VERSION_NUMBER           NEW.

configure.ac

@@ -870,9 +870,9 @@ AC_CHECK_MEMBER(struct cmsghdr.cmsg_len,
 #include <unistd.h>
        ])
 
-use_descriptor_passing=no
+use_descriptor_passing=yes
 AC_ARG_ENABLE(fd-passing,
-  AC_HELP_STRING([--enable-fd-passing], [use FD passing if supported]),
+  AC_HELP_STRING([--disable-fd-passing], [do not use FD passing]),
   use_descriptor_passing=$enableval)
 
 if test "$supports_descriptor_passing" != "yes"; then

src/engine-uiserver.c

@@ -1338,7 +1338,7 @@ struct engine_ops _gpgme_engine_ops_uiserver =
     uiserver_set_io_cbs,
     uiserver_io_event,
     uiserver_cancel,
-    NULL		/* cancel_op */
+    NULL,		/* cancel_op */
     NULL,               /* passwd */
     NULL                /* set_pinentry_mode */
   };