ci: don't use ninja on linux
ci: don't use ninja on linux

I got this error when re-running the cmake line setting
-DZIG_EXECUTABLE:

```
ninja: warning: multiple rules generate zig1.o. builds involving
this target will not be correct; continuing anyway
[-w dupbuild=warn]
```

But it works fine with make.

raulgrell/zig,zig-lang/zig,raulgrell/zig,andrewrk/zig,raulgrell/zig,raulgrell/zig,zig-lang/zig,zig-lang/zig,raulgrell/zig,andrewrk/zig