build: Add missing function checks for optional daemon features.

* config-daemon.ac: Check for lchown, posix_fallocate, vfork,
  sched_setaffinity, statvfs, nanosleep, and strsignal.  As a side
  effect, this enables daemon features depending on the corresponding
  feature test macros.

gnu: gp2c: Upgrade to 0.0.9pl1.

* gnu/packages/algebra.scm (gp2c): Upgrade to 0.0.9pl1.

vm: Clarify 'system-qemu-image/shared-store-script'.

* gnu/system/vm.scm (system-qemu-image/shared-store-script): Move
  'initrd' definition to the top-level.  Have a single definition of
  'initrd', 'image', and 'os-drv'.

system: Add 'operating-system-boot-script'.

* gnu/system.scm (operating-system-boot-script): New procedure.
  (operating-system-derivation): Use it.  Remove DMD-CONF from the
  file union.  Add BOOT-DRV to the inputs.

system: Factorize (gnu system).

* gnu/system.scm (operating-system-accounts,
  operating-system-etc-directory): New procedures.
  (operating-system-derivation): Use them.
* gnu/services/base.scm (%base-services): Add 'host-name-service'
  invocation.

gnu: cyrus-sasl: Add alternate source URL.

* gnu/packages/cyrus-sasl.scm (cyrus-sasl)[source]: Add alternate URL;
  the previous one is currently unreachable.

gnu: mplayer: Add mpg123 as an input.

* gnu/packages/video.scm (mplayer)[inputs]: Add mpg123.

gnu: Add mpg123.

* gnu/packages/mp3.scm (mpg123): New variable.

gnu: Add GCC 4.9.0.

* gnu/packages/gcc.scm (gcc-4.9): New variable.
* gnu/packages/base.scm (gcc-toolchain-4.9): New variable.

gnu: openssl: Fixes for CVE-2010-5298 and extension checking.

* gnu/packages/patches/openssl-CVE-2010-5298.patch: New file.
* gnu/packages/patches/openssl-extension-checking-fixes.patch: New file.
* gnu/packages/openssl.scm (openssl): Add them.
* gnu-system.am (dist_patch_DATA): Add them.

pk-crypto: Add pretty-printer to 'gcry-error' exceptions.

* guix/pk-crypto.scm (string->canonical-sexp, sign, generate-key): Pass
  the procedure name as the first argument to 'throw'.
  (gcrypt-error-printer): New procedure.
  <top level>: Add call to 'set-exception-printer!'.
* guix/nar.scm (restore-one-item): Add 'proc' parameter to 'catch'
  handler for 'gcry-error.
* guix/scripts/archive.scm (%options, generate-key-pair, authorize-key):
  Likewise.
* guix/scripts/substitute-binary.scm (narinfo-signature->canonical-sexp):
  Likewise.

authenticate: Allow signatures with binary data to be written to stdout.

Fixes <http://bugs.gnu.org/17312>.

* guix/scripts/authenticate.scm (guix-authenticate): Add calls to
  'set-port-encoding!' and 'set-port-conversion-strategy!'.  Wrap body
  in 'with-fluids' form that sets '%default-port-encoding' and
  '%default-port-conversion-strategy'.
* tests/guix-authenticate.sh: Add test.
* tests/pk-crypto.scm ("hash corrupt due to restrictive locale
  encoding"): Add reference to bug.

pk-crypto: Use ISO-8859-1 for strings passed to 'gcry_sexp_new'.

* guix/pk-crypto.scm (string->canonical-sexp): Pass "ISO-8859-1" as the
  2nd argument to 'string->pointer'.
* tests/pk-crypto.scm ("version"): New test.
  ("hash corrupt due to restrictive locale encoding"): New test.

nar: Really really protect the temporary store directory from GC.

This is a follow-up to 6071b55e10b7b6e67d77ae058c8744834889e0b4.
See <https://lists.gnu.org/archive/html/guix-devel/2014-04/msg00167.html>
for the original report, and
<https://lists.gnu.org/archive/html/guix-devel/2014-04/msg00198.html>
for an alternate solution that has been discussed.

* guix/nar.scm (temporary-store-file): Remove call to
  'add-permanent-root'; don't loop.
  (with-temporary-store-file): Rewrite using 'with-store' and
  'add-temp-root'.

gnu: Add mplayer.

* gnu/packages/video.scm (mplayer): New variable.

gnu: xorg: libxxf86dga: Propagate input xf86dgaproto.

* gnu/packages/xorg.scm (libxxf86dga): Propagate input xf86dgaproto.

gnu: Add vlc.

* gnu/packages/video.scm (vlc): New variable.

gnu: lua: Add older version 5.1.5.

* gnu/packages/lua.scm (lua-5.1): New variable.

gnu: lua: Upgrade to 5.2.3.

* gnu/packages/lua.scm (lua): Upgrade to 5.2.3.

gnu: lua: Compile with -fPIC.

* gnu/packages/lua.scm (lua): Add -fPIC to CFLAGS and LDFLAGS.