Improving installation file for Arch-based distro

[P4rs3R]

In order to be sure the installing process goes without any issue, here installing_deps_archlinux.sh would be better adding (at the beginning) something like:

sudo pacman -Syy cmake
sudo pacman -Syu base-devel yaourt

(So, if users have them, nothing happens; if don't, simply install them ... like in my case ;) ) I tried to pull a request to merge on that file, but it seems I ain't able to edit it. By the way, you can also chmod +x that file, to have the same permission as in the other "standard" ./install (the one for Debian and Ubuntu). PS: at this moment, it seems like there's something wrong with ssdeep: pip install ssdeep --> running egg_info [...] fuzzy.h: No such file or directory

(Python 2.7.14 and Python3 3.6.4, pip and pip3 both 9.0.1) Tested on Linux Manjaro 4.14.16 x64