Dependencies for BinDeps

[Hydrotoast]

Hi all, I recently ran into an issue where a package would not build properly because Arch linux does not ship with an unzip command which is used by FileUnpacker if the file contains a .zip extension.

LoadError: could not spawn `unzip -x /home/hydrotoast/.julia/v0.5/HttpParser/deps/downloads/v2.7.1.zip -d /home/hydrotoast/.julia/v0.5/HttpParser/deps/src`: no such file or directory (ENOENT)
while loading /home/hydrotoast/.julia/v0.5/HttpParser/deps/build.jl, in expression starting on line 71

======================================================================================================================

===================================================[ BUILD ERRORS ]===================================================

WARNING: HttpParser had build errors.

 - packages with build errors remain installed in /home/hydrotoast/.julia/v0.5
 - build the package(s) and all dependencies with `Pkg.build("HttpParser")`
 - build a single package by running its `deps/build.jl` script

======================================================================================================================

The solution was to install unzip with the native package manager. I also see that 7z seems to be an implicit dependency for unpacking on Windows.

Could we add these dependencies to the deps/build.jl of this package to automatically resolve these dependencies?

[americast]

@Hydrotoast Addressed for Arch Linux in PR #266.

Gramercy...

[rgohou]

Not fixed on FreeBSD 11