generator differences between windows and unix based systemsport

### Expected Behaviour
project init via cli then checked into git repo should be able to be used and created in a mixed OS environment
aio app init on windows
git clone, aio app run MAC

### Actual Behaviour
aio app init on windows
git clone, aio app run breaks on extension config include MAC

### Reproduce Scenario (including but not limited to)
aio app init on windows
git clone, aio app run MAC

#### Steps to Reproduce
aio app init on windows
git clone, aio app run MAC

#### Environment Info
```
System:
OS: Windows 10 10.0.19043
CPU: (8) x64 Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
Memory: 28.28 GB / 47.96 GB
Binaries:
Node: 14.17.0
Yarn: 1.22.5
npm: 6.14.13
Virtualization:
Docker: 20.10.8
npmGlobalPackages:
@adobe/aio-cli: Not Found
```
#### Sample Code that illustrates the problem
Windows
$include: src\dx-excshell-1\ext.config.yaml

unix
$include: src/dx-excshell-1/ext.config.yaml

The unix format works on both windows and unix but the opposite is not true. I checked in a newly build project from windows and Stephan checked it out and it was broke for him.

#### Logs taken while reproducing problem