Change 'nix-upstream' submodule URL.

* .gitmodules: Use https, not http.  Reported by
  Pjotr Prins <pjotr.public12@thebird.nl>.

linux-initrd: Update /etc/mtab.

* guix/build/linux-initrd.scm (mount-root-file-system): Populate
  /root/etc/mtab.
  (mount-file-system): Update ROOT/etc/mtab.

Remove now unneeded (guix build gnome) module.

* guix/build/gnome.scm: Remove.
* Makefile.am (MODULES): Update accordingly.

gnu: Make $XDG_DATA_DIRS a search path variable for GLib.

* gnu/packages/glib.scm (glib): Add 'native-search-paths' and
  'search-paths' fields.
* gnu/packages/gnome.scm (libpeas): Remove 'arguments' field.
  (librsvg)[arguments]: Remove #:modules and #:imported-modules.
  Remove settings of INTROSPECTION_SCANNER_ARGS and
  INTROSPECTION_COMPILER_ARGS in makefiles.
* gnu/packages/gtk.scm (gtk+): Likewise.

gnu: gobject-introspection is usually meant to be a native input.

* gnu/packages/gtk.scm (atk, pango, gdk-pixbuf, gtk+): Move
  gobject-introspection to 'native-inputs' since it's only used at build
  time.
* gnu/packages/gnome.scm (libpeas): Move pkg-config,
  gobject-introspection, and intltool to 'native-inputs'.

gnu: Add librsvg.

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

linux-initrd: Delete files from the initrd ramfs when switching roots.

* guix/build/linux-initrd.scm (switch-root): Delete file from the old
  root.  Chdir to / after 'chroot' call.  Re-open file descriptors 0, 1,
  and 2.
  (boot-system): Move 'loading' message after the 'switch-root' call.
* gnu/system.scm (operating-system-boot-script): Add loop that closes
  file descriptor before calling 'execl'.

gnu: pius: Use Python 2.

* gnu/packages/gnupg.scm (pius): Use Python 2.

gnu: make-bootstrap: Add missing export.

* gnu/packages/make-bootstrap.scm: Export '%guile-static-stripped'.  The
  problem was hidden because of <http://bugs.gnu.org/17418>.

gnu: e2fsprogs: Install the libext2fs Info manual.

* gnu/packages/linux.scm (e2fsprogs)[native-inputs]: Add TEXINFO.

gnu: e2fsprogs: Use 'static-package' for the statically-linked variant.

* gnu/packages/linux.scm (e2fsprogs/static): Remove.
  (e2fsck/static): Use (static-package e2fsprogs) instead.

gnu: gdb: Upgrade to 7.7.1.

* gnu/packages/gdb.scm (gdb): Upgrade to 7.7.1.

gnu: gdb: Add dependency on libxml2.

* gnu/packages/gdb.scm (gdb)[inputs]: Add LIBXML2.

gnu: Add libgsf.

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

gnu: Add libcroco.

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

gnu: pybugz: Add fixlet patches.

* gnu/packages/python.scm (python2-pybugz)[source]: Add 'patches'
  field.
* gnu/packages/patches/pybugz-encode-error.patch,
  gnu/packages/patches/pybugz-stty.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.

gnu-maintenance: Add missing type check.

* guix/gnu-maintenance.scm (gnu-package?): Only call 'mirror-type' when
  URL is a string.

linux-initrd: Improve root file system switching.

* guix/build/linux-initrd.scm (move-essential-file-systems,
  switch-root): New procedures.
  (MS_MOVE): New variable.
  (boot-system): Remove 'mount-essential-file-systems' call for ROOT.
  Use 'switch-root' instead of chdir + chroot.

services: networking: Fix typo in static networking service.

* gnu/services/networking.scm (static-networking-service): Use
  $inetutils/bin/ifconfig, not $inetutils/sbin/ifconfig.

gnu: Add missing import in (gnu packages maths).

* gnu/packages/maths.scm: Use (guix utils), which was needed since
  b9100e2f.