* Use thread number from Travis docs
The other number is probably incorrect.
See https://github.com/travis-ci/travis-ci/issues/4696
* Add macOS to travis builds
* Remove unnecessary libraries
Not sure why these were added in the first place.
First commit that added them: 6aecb42e42ae12bd16c7230ecef0807fa54b0d92
* Fix server-only build on macOS
Now there are:
- dependencies-vs
- dependencies-vs-64bit
- dependencies-mingw
- dependencies-mingw64
And if it's not found, then fallback to:
- dependencies
- dependencies-64bit
So that if you use only one compiler, then you can just still use "dependencies" or "dependencies-64bit".
And I didn't restrict it to WIN32 only, because in theory it should be possible to put there openglrecorder for linux build.
Atm. use it only on linux, because there is no need to spam with cmake warnings on other platforms.
Also fallback to built-in enet if system enet is not found.
It's not 100% ready yet, but some testing won't hurt.
It's possible to switch between wayland/x11 using
export IRR_DEVICE_TYPE=x11
or
export IRR_DEVICE_TYPE=wayland
so that x11 device can be forced in wayland session.
The option is enabled by default, but the system version will only be used
if found and newer than 2.0.0 (to ensure that https://sourceforge.net/p/glew/patches/40/
is fixed). When missing, we silently fallback to the vendored source code,
so there is no change for e.g. Windows compilation.
It's possible that STK was using these files for compilation when cmake was run from main directory. In this case compiled files are stored in stk-code/lib, so that CMAKE_CURRENT_BINARY_DIR is stk-code/lib/irrlicht rather than stk-code/build/lib/irrlicht and we include whole lib/libpng rather than non-existing directory.
