`make check` fails on Windows 10
`make check` fails on Windows 10

* GNU Make 4.2
* Windows 10
* PowerShell

```ps
PS C:\Users\okr\gfx> make check
#Note: excluding `warden` here, since it depends on serialization
process_begin: CreateProcess(NULL, #Note: excluding `warden` here, since it depends on serialization, ...) failed.
make (e=2): Das System kann die angegebene Datei nicht finden.
make: *** [makefile:49: check] Error 2
```
gfx-rs/gfx-rs