php53: fix on darwin

* add libssh2 to build inputs (configure fails without this)
* link with stdc++
* add icu/lib directory to DYLD_LIBRARY_PATH (and wrap binaries with this
  environment variable
* add libiconv to build inputs
* fix --with-iconv configure flag (was --with-iconv-dir which is not a valid
  flag)
php53: add optional pcntl flag
php53: restore nix gd version
php53-xdebug: add expression
yesod-bin: as of yesod 1.2, binaries are kept in yesod-bin.
Make most of Ruby Gem builds repeatable
Add a stdenv version which tries harder to make builds repeatable.
networkmanagerapplet: 0.9.8.0 -> 0.9.8.2

Upgraded because some icons weren't displaying. Also adds new
dependency libsecret.
Linux 3.9.7

Signed-off-by: Shea Levy <shea@shealevy.com>
Python: add DETERMINISTIC_BUILD env var. If set, python doesn't write timestamps to pyc files. Tested by
building argparse, compiling from cli, compiling using py_compile.
Merge pull request #662 from rnons/yesod-bin

yesod-bin: as of yesod 1.2, binaries are kept in yesod-bin.
Add supervisor, a system for controlling process state under UNIX
memtest86: udpate to 4.1.0, fix download url
Merge pull request #666 from offlinehacker/python_supervisor

Add supervisor, a system for controlling process state under UNIX
Merge pull request #665 from offlinehacker/memtest_fix

memtest86: udpate to 4.1.0, fix download url
haskell-hledger-irr: add version 0.1.1.2
git-annex: fix installation of git-annex-shell
update pulseaudio to 4.0 and sbc to 1.1
remake: bump from version 3.81+dbg-0.2 to 3.82+dbg-0.6

This version needs readline. And the license is GPLv3. Also, add
meta.platforms and meta.maintainers attributes.
libcap needs to be a propagated build input for pulseaudio