Check the return value from pipe(2)

Starting from GCC 10 not checking this will produce a warning.

src/wine-host/group-host.cpp

@@ -78,6 +78,11 @@ int __cdecl main(int argc, char* argv[]) {
                   << std::endl;
         std::cerr << error.what() << std::endl;
 
+        return 0;
+    } catch (const std::system_error& error) {
+        std::cerr << "Could not create pipe:" << std::endl;
+        std::cerr << error.what() << std::endl;
+
         return 0;
     }
 }