Fixes build errors for the third-party mongoose module:
```
In file included from
/nix/store/r5s3w32ahjzdlzsfrhybc3l2qcpi6yb2-libpcap-1.9.0/include/pcap.h:43,
from /build/ntopng-2.0/include/ntop_includes.h:93,
from src/HTTPserver.cpp:22:
/nix/store/r5s3w32ahjzdlzsfrhybc3l2qcpi6yb2-libpcap-1.9.0/include/pcap/pcap.h:958: note: this is the location of the previous definition
#define INVALID_SOCKET -1
src/../third-party/mongoose/mongoose.c:270:13: error: multiple types in one declaration
typedef int SOCKET;
^~~~~~
```
In 724e833ea2, I was a little too aggressive in enabling these flags.
Many don’t work in gcc, and we should probably avoid settings them
widely. This makes those flags optional on isclang
All geoip data files have changed, update hashes. The ntopng source url
itself has changed, the source is now located in an "old/" directory
(hash unchanged).
Build tested.
