gnu: guile-ncurses: Work around missing test files.

* gnu/packages/patches/guile-ncurses-tests.patch: New file.
* gnu/packages/guile.scm (guile-ncurses)[source]: Use it.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: icu4c: Upgrade to 53.1.

* gnu/packages/icu4c.scm (icu4c): Upgrade to 53.1.

gnu: icu4c: Fix failing test.

* gnu/packages/patches/icu4c-test-date-format.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/icu4c.scm (icu4c)[source]: Use it.

gnu: qemu: Remove dependency on Samba.

* gnu/packages/qemu.scm (qemu-headless)[inputs]: Remove SAMBA.
  [arguments]: Remove --smbd configure flag.

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

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++.

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.

gnu: grep: Upgrade to 2.20.

* gnu/packages/base.scm (grep): Upgrade to 2.20.

gnu: gettext: Upgrade to 0.19.1.

* gnu/packages/gettext.scm (gnu-gettext): Upgrade to 0.19.1.