Fix build with GCC 14 and 15
Fix pointer type casts for shared memory variables:
- Added explicit casts for pointers to match expected types:
DATAlength, connection_data, LISTlength, mask, logged_connections,
running_connections, TCP_nr_of_packets, TCP_bytes_in_packets,
ICMP_nr_of_packets, UDP_nr_of_packets, UDP_bytes_in_packets,
IP_nr_of_packets.
- This resolves compiler warnings about incompatible pointer types when
assigning from the shared memory block (SHARED).
- No functionality was changed; only type safety and compatibility fixed.
Closes: #7