gnu: evince: Set search path for MIME info.

* gnu/packages/gnome.scm (evince): Add #:phases argument.  Remove "perl"
  and "perl-xml-parser" inputs since they are not directly needed; move
  "intltool" to 'native-inputs'.

gnu: Add shared-mime-info.

* gnu/packages/gnome.scm (shared-mime-info): New variable.

gnu: Add libgnome-keyring and Evince.

* gnu/packages/gnome.scm (libgnome-keyring, evince): New variables.

gnu: gnome: Add brasero.

* gnu/packages/gnome.scm (brasero): New variable; not totally usable due to
    lacking inputs.

gnu: Add hicolor-icon-theme.

* gnu/packages/gnome.scm (hicolor-icon-theme): New variable.

gnu: gnome: Add gnome-icon-theme.

* gnu/packages/gnome.scm (gnome-icon-theme): New variable.

gnu: Add icon-naming-utils.

* gnu/packages/gnome.scm (icon-naming-utils): New variable.

gnu: gnome: Add gsettings-desktop-schemas.

* gnu/packages/gnome.scm (gsettings-desktop-schemas): New variable.

gnu: gnome: Add libnotify.

* gnu/packages/gnome.scm (libnotify): New variable.

Merge branch 'master' into core-updates

gnu: Add gnome-doc-utils.

* gnu/packages/gnome.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add module.