install_deps: add support for OpenVDB.

Note that recent DEB-based distro have packages for this, even simpler!

Differential Revision: https://developer.blender.org/D1933

install_deps: add check for glew version, too old ones are not compatible with OSD.

In case too old system glew is detected, use the one shipped with blender.

Part of D1933.

install_deps: bunch of cleanups, tweaks and micro-fixes.

This commit mostly:
* removes some (very) old messages or hacks (like those for ubuntu 10.4...).
* Moves lib-specific dependencies installations to upper level
(simpler to manage, and those are small enough packages).
* Uses new dnf package manager for fedora (sigh, we now have tree different commands for fed/suse/rehl).
* fixes or enhances some options for commandline tools.
* Force anew building of oiio package, due to insane dependencies of this one in recent distro.

Part of D1933.

Update install_deps.sh for ArchLinux.

The script is updated for ArchLinux, since all dependencies are included in Arch's official repositories.

I've made a few changes, such as enabling OCIO and OSD without requiring locally installed lib-path, and a fix to ''get_package_version_ARCH()' so it ignores package epoch (as in the case of ffmpeg).

I intend to look at OpenVDB next.

Reviewers: mont29

Differential Revision: https://developer.blender.org/D1901