Reverting "gnu: ncurses: Build libtinfo."

This reverts commit 953c9fcf8c1a2e0cbebadd9c07591caed7d26f8a.  It turns
out that most packages (guile-ncurses, cursynth, aumix, util-linux,
etc.) expect libncurses to provide everything.  So they had to be
patched to add -ltinfow to their LDFLAGS, which is counterproductive.

Other recent distros take that approach---e.g.,
<https://bugs.launchpad.net/ubuntu/+source/ncurses/+bug/259139>.

gnu: apr: Build sequentially.

* gnu/packages/apr.scm (apr)[arguments]: New field.

gnu: Remove dependency from gzip to the bootstrap binaries.

* gnu/packages/base.scm (grep-final): New variable.
  (%boot5-inputs): Add it.
  (%final-inputs): Use it.

gnu: gcc: Really avoid 'install-strip' when cross-compiling.

This is a followup to 6b9229c.

* gnu/packages/gcc.scm (gcc-4.7): Turn 'install-target' into a thunk,
  so (%current-target-system) is current.

Merge branch 'master' into core-updates

ui: Avoid circularity with (guix gexp).

Fixes a regression introduced in 56b8210 ("guix build: Allow gexps to be
passed to '-e'.")

* guix/ui.scm (%guix-user-module): Wrap in 'delay'.
  (read/eval): Adjust accordingly.

i18n: Move package descriptions from 'guix' to 'guix-packages'.

* po/guix: Merge with po/packages as per
  <https://lists.gnu.org/archive/html/guix-devel/2014-06/msg00058.html>.
* po/packages/LINGUAS: Add eo, pt_BR, sr, and vi.

guix: Look for "guix-packages" messages in $localedir.

* scripts/guix.in (run-guix-main): Add 'bindtextdomain' call.

guix build: Allow gexps to be passed to '-e'.

* guix/ui.scm (%guix-user-module): New variable.
  (read/eval): Pass it as the second argument to 'eval'.
* guix/scripts/build.scm (options/resolve-packages): Add case for
  'gexp?'.
* tests/guix-build.sh: Add tests.
* doc/guix.texi (Invoking guix build): Document '-e gexp'.
guxi build: Allow gexps to be passed to '-e'.

* guix/ui.scm (%guix-user-module): New variable.
  (read/eval): Pass it as the second argument to 'eval'.
* guix/scripts/build.scm (options/resolve-packages): Add case for
  'gexp?'.
* tests/guix-build.sh: Add tests.
* doc/guix.texi (Invoking guix build): Document '-e gexp'.

gnu: gcc-4.7: Upgrade to 4.7.4.

* gnu/packages/gcc.scm (gcc-4.7): Upgrade to 4.7.4.

gnu: gcc: Don't use the 'install-strip' target when cross-compiling.

* gnu/packages/gcc.scm (gcc-4.7): Add 'install-target' variable.  Use
  it in the 'install' phase.

gnu: gcc: Fix cross-compilation of gcc (Canadian cross).

* gnu/packages/gcc.scm (gcc-4.7)[arguments] <#:make-flags>:
  When (%current-target-system) is true, pass the empty list or
  '("CFLAGS=-g0 -O2").

gnu: make-bootstrap: Make sure %gcc-stripped binaries are usable.

* gnu/packages/make-bootstrap.scm (%gcc-stripped):
  When (%current-target-system) is false, run gcc, g++, and cpp with
  --version.

gnu: make-bootstrap: Build %gcc-static with --disable-lto.

* gnu/packages/make-bootstrap.scm (%gcc-static): Pass --disable-lto.

gnu: Add pingus.

* gnu/packages/games.scm (pingus): New variable.
* gnu/packages/patches/pingus-sdl-libs-config.patch: New patch.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: Add busybox.

* gnu/packages/busybox.scm: New file.
* gnu-system.am: Add gnu/packages/busybox.scm.

gnu: make-bootstrap: Build libstdc++ in '%gcc-static'.

* gnu/packages/make-bootstrap.scm (%gcc-static): Re-enable C++.

Separate package description translations from string translations.

* po/packages/LINGUAS, po/packages/Makevars, po/packages/POTFILES.in:
  New files.
* po/guix/Makevars (DOMAIN): Change to "guix".
  (XGETTEXT_OPTIONS): Remove "--keyword=synopsis --keyword=description".
* po/guix/POTFILES.in: Remove gnu/packages/*.scm.
* configure.ac: Change to gettext 0.18.3.  Produce
  po/packages/Makefile.in.
* Makefile.am (SUBDIRS): Add po/packages.
* guix/ui.scm (%package-text-domain): New variable.
  (P_): New procedure.
  (package->recutils): Use 'P_' instead of '_'.
* guix/scripts/package.scm (find-packages-by-description): Use 'P_'
  instead of 'gettext'.

Move gettext files to 'po/guix'.

* po: Rename to...
* po/guix: ... this.
* po/guix/Makevars (subdir, top_builddir): Adjust accordingly.
* configure.ac: Change 'po/Makefile.in' to 'po/guix/Makefile.in'.
* Makefile.am (SUBDIRS): Change 'po' to 'po/guix'.

gnu: make-bootstrap: Use single-output GCCs.

* gnu/packages/make-bootstrap.scm (package-with-relocatable-glibc)[native-inputs]:
  Add 'outputs' field for the rewritten GCC.
  (%gcc-stripped): Add 'outputs' field.