Public bug reported:

I expect to be able to compile the following program (and indeed I am
able to compile it on Ubuntu release before 15.10):

```
// test.c
#include "sys/capability.h"
#include "netinet/in.h"
#include "linux/netfilter/nf_nat.h"

int main() {
  // Program that needs to call capset() and htonl(), and also needs
  // to do some netfilter things with NF_ACCEPT...
}
```

However, on 15.10 I get a bunch of errors:


```
$ gcc test.c
In file included from test.c:3:0:
/usr/include/linux/in.h:28:3: error: redeclaration of enumerator ‘IPPROTO_IP’
   IPPROTO_IP = 0,  /* Dummy protocol for TCP  */
   ^
/usr/include/netinet/in.h:42:5: note: previous definition of ‘IPPROTO_IP’ was 
here
     IPPROTO_IP = 0,    /* Dummy protocol for TCP.  */
     ^
...
```

This bug breaks the build for Sandstorm on Ubuntu 15.10:
https://github.com/sandstorm-io/sandstorm/issues/1049


```
$ lsb_release -rd
Description:    Ubuntu 15.10
Release:        15.10

$ apt-cache policy linux-libc-dev
linux-libc-dev:
  Installed: 4.2.0-16.19
  Candidate: 4.2.0-16.19
  Version table:
 *** 4.2.0-16.19 0
        500 http://us.archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
        100 /var/lib/dpkg/status
```

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1509894

Title:
  Cannot include "netinet/in.h" with "linux/netfilter/nf_nat.h" and
  "sys/capability.h"

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