tcplife not working on Ubuntu 19.10

Running `tcplife-bpfcc` on Ubuntu 19.10 results in the following error:
```
# tcplife-bpfcc
In file included from /virtual/main.c:4:
In file included from include/linux/tcp.h:19:
In file included from include/net/sock.h:46:
In file included from include/linux/netdevice.h:42:
In file included from include/net/netprio_cgroup.h:11:
In file included from include/linux/cgroup.h:28:
In file included from include/linux/cgroup-defs.h:22:
In file included from include/linux/bpf-cgroup.h:5:
include/linux/bpf.h:115:3: error: variable has incomplete type 'struct bpf_spin_lock'
(struct bpf_spin_lock){};
^~~~~~~~~~~~~~~~~~~~~~~~
[...]
49 warnings and 12 errors generated.
Traceback (most recent call last):
File "/usr/sbin/tcplife-bpfcc", line 486, in
b = BPF(text=bpf_text)
File "/usr/lib/python2.7/dist-packages/bcc/__init__.py", line 320, in __init__
raise Exception("Failed to compile BPF text")
Exception: Failed to compile BPF text
```

This can be reproduced on a freshly installed Ubuntu 19.10 by installing the `bpfcc-tools` package version `0.8.0-4`. Running other TCP related tools results in similar error messages.

```
$ uname -a
Linux pc-540 5.3.0-24-generic #26-Ubuntu SMP Thu Nov 14 01:33:18 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
```

Start by reproducing the failure with tcplife-bpfcc from bpfcc-tools 0.8.0-4 on Ubuntu 19.10 and the reported 5.3.0-24-generic kernel. Trace the compilation failure through the shown Linux networking headers and bcc/__init__.py, then verify that tcplife and the other affected TCP tools compile and run successfully.

Written by the indexing model from the issue text.