iceoryx2 cannot be build with cmake when included as submodule

[elBoberido]

Required information

Operating system:

any

Rust version:

any

Cargo version:

any

iceoryx2 version:

main branch

Detailed log output: n/a

Observed result or behaviour:

iceoryx2 cannot be build with cmake when the repo is included as submodule into another repo

Expected result or behaviour:

iceoryx2 can be included as submodule

Conditions where it occurred / Performed steps:

include iceoryx2 as submodule and build with cmake