kernel: Enable PPP_FILTER by default.

pppd will try to use it to improve efficiency and complain if it's not available
(but is is not mandatory).
docker: propagate nix.proxy into daemon environment
double_conversion: add package
libxls: add package
xlslib: add package
text-binary: add haskell package
Merge pull request #4880 from abbradar/text-binary

text-binary: add haskell package
libiberty: add package
boost_process: add package
cppzmq: add package
Merge pull request #4879 from abbradar/cppzmq

cppzmq: add package
Merge pull request #4884 from abbradar/xlslib

xlslib: add package
Merge pull request #4885 from abbradar/libxls

libxls: add package
folly: add package
Merge pull request #4883 from abbradar/boost-process

boost_process: add package
Merge pull request #4882 from abbradar/folly

Folly: add package
gmpc: fix missing dependence
lshw: fix location of the binary

The binary was going into sbin so even with package in profile we still
couldn't use it.

cc @phreedom
ocamlnet: update from 3.7.6 to 3.7.7
ocaml-http: update from 0.1.3 to 0.1.5