gnu: 'autoconf-wrapper' is no longer a procedure.

gnu: 'autoconf-wrapper' is no longer a procedure.

Fixes <https://bugs.gnu.org/30710>.
Suggested by Björn Höfling <bjoern.hoefling@bjoernhoefling.de>.

* gnu/packages/autotools.scm (autoconf-wrapper): Rename to...
(make-autoconf-wrapper): ... this.  Add 'properties' field.
(autoconf-wrapper): New variable.
* gnu/packages/gnunet.scm (guile-gnunet): Adjust accordingly.
* gnu/packages/gnupg.scm (signing-party): Likewise.
* gnu/packages/guile.scm (guile-ics, guile-bash): Likewise.
* gnu/packages/libevent.scm (libuv): Likewise.
* gnu/packages/logging.scm (glog): Likewise.
* gnu/packages/mail.scm (libetpan): Likewise.
* gnu/packages/mate.scm (mate-icon-theme-faenza)
(mate-screensaver): Likewise.
* gnu/packages/package-management.scm (guix): Likewise.
* gnu/packages/sawfish.scm (librep): Likewise.
* gnu/packages/video.scm (motion): Likewise.
* gnu/packages/zile.scm (zile-on-guile): Likewise.