Log Message:
Update libsoup to 2.54.0.1

Add gssapi option (default off)

Changes in libsoup from 2.53.92 to 2.54.0.1:

	* (2.54.0.1 fixes a build problem with the 2.54.0 tarball,
          which would not build if you configured with
          "--without-gnome". There are no other changes between 2.54.0
          and 2.54.0.1.)

	* Fixed examples/simple-httpd on Windows [#758759, Chun-wei
          Fan]

Changes in libsoup from 2.53.90 to 2.53.92:

	* libsoup now supports HTTP "Negotiate"/GSSAPI/Kerberos
          authentication. It must be enabled specifically by the
          application and is also subject to certain other
          restrictions, some of which are not yet controllable through
          the API. [#587145, Guido Guenther, Tomas Popela, David
          Woodhouse, Dan Winship]

	* Added support for building under MSVC [#758759, Chun-wei
          Fan]

	* Fixed a problem with the 2.53.90 tarball that caused
          translations to be mis-installed.

	* Updated translations:
	  Occitan

Changes in libsoup from 2.53.2 to 2.53.90:

	* NUL bytes in headers are now ignored [#760832, Dan Winship]

	* Fixed transfer annotation of soup_form_decode* functions
          [#743966, Lionel Landwerlin]

	* Updated translations:
	  Bulgarian, Latvian, Norwegian bokmål

Changes in libsoup from 2.53.1 to 2.53.2:

	* Fixed up symbol visibility handling for mingw by copying
          GLib's system [Ignacio Casal Quinteiro, #757146]

	* Finally marked the old SoupSessionAsync and SoupSessionSync
          methods as deprecated [Ignacio Casal Quinteiro, Dan Winship,
          #757146]

	* Added libsoup-2.4.deps for valac [Rico Tzschichholz]

	* Make it possible to build from git without gtk-doc being
          installed [Ignacio Casal Quinteiro]

	* Updated translations:
	  Norwegian bokmål, Occitan

Changes in libsoup from 2.52.1 to 2.53.1:

	* Really fixed build under MinGW for sure this time [Ignacio
          Casal Quinteiro]

        * Fixed SoupServer Web Sockets code so that the
	  SoupClientContext passed to a SoupServerWebsocketCallback is
	  fully usable (rather than crashing when you try to do most
	  things).