ProjectExplorer: Introduce a Utils::OsType IDevice::osType() function

E.g. for easier construction of command lines in situations like

    if (isLocal())
        runnable.commandLineArguments = argumentString(Utils::HostOsInfo::hostOs());
    else
        runnable.commandLineArguments = argumentString(Utils::OsTypeLinux);

Change-Id: I5a35304e5d1b5a042952201f39f4134a5cd0ce24
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/ios/iosdevice.cpp

@@ -213,6 +213,11 @@ bool IosDevice::canAutoDetectPorts() const
     return true;
 }
 
+Utils::OsType IosDevice::osType() const
+{
+    return Utils::OsTypeMac;
+}
+
 
 // IosDeviceManager