Add support for package checking for Antergos (and other arch based distros)

Even if the distro has been discontinued, it's still and ArchLinux install with some package from the AUR that are from the Antergos repo. Which will be removed soon by a last antergos specific update. But can "Antergoslinux" be treated like arch linux? The same applies to ArcoLinux. And likely to Manjaro.

/t/gaming-flightcheck ❯❯❯ ./print_system_info.py                                                                                                                           ✘ 1 

Distribution : Antergoslinux

GPU list :
    Intel 3rd Gen Core processor Graphics Controller (00:02.0)
        Available modules: i915
        Module in use: i915

OpenGL :
    Renderer: Mesa DRI Intel(R) Ivybridge Mobile 
    Vendor: Intel Open Source Technology Center
    OpenGL version: 3.0
    OpenGL vendor version: Mesa 19.0.4

Available CPU governors: performance/powersave
Current CPU governor: powersave

System file limit : 524288

Nvidia Page Attribute Table usage enabled : no

PRIME Sync : supported on 0 monitor(s), enabled on 0

Vulkan :
    libvulkan present :
        32-bit : no
        64-bit : yes
    Available ICDs :
    Extensions :

Packages checking is not supported for this distribution.

Askannz / gaming-flightcheck

Add support for package checking for Antergos (and other arch based distros) #6