boost: Add optional Boost.MPI support

Boost.MPI is a C++ interface library to the
message passing interface (MPI) standard.
android-ndk: r9d -> r10c
Removed duplicate
ghostscript: drop GNU fork and update
qpdf: add package
ijs: add package
cups: update package
cups-filters: add package
epdfview: fix building with cups 2.0
pycups: update package
foomatic-filters: fix building with cups-2
kernel: 3.17.2 -> 3.17.3
kernel: 3.14.23 -> 3.14.24
libnl: 3.2.23 -> 3.2.25
libnl: Remove old 3.2.19 version
Merge pull request #4800 from aherrmann/pr_boost_mpi

boost 1.55: Add Boost.MPI (optional)
pgpool: Add derivation
gtkdatabox: update from 0.9.1.3 to 0.9.2.0
pastebinit: fix build
limit the amount of time ssh-agent keeps a key (default: 1h)