Add iOS case for GetOperatingSystem() function in util.h for soundness on iOS

[ann0see]

Describe the bug

jamulus/src/util.h

Line 1097 in d1dfd33

static EOpSystemType GetOperatingSystem()

does not seem to handle iOS explicitly. (Spotted by looking through code).
This function will probably return OT_MAC_OS on iOS builds (at least explorer.jamulus.io says so), since there aren't iOS servers around (yet).

To Reproduce

Compile Jamulus for iOS as server and check if it returns macOS or Linux.

Expected behavior

Should return iOS

Screenshots

N/A

Operating system

iOS

Version of Jamulus

source code from main.

Additional context

/

[ann0see]

Ok. Can be fixed by removing the defined ( __APPLE__ ) from the macOS case and adding a

#elif defined ( Q_OS_IOS )  
    return OT_I_OS;

case.