Remove inclusion of ip_compat.h for FreeBSD

[dim]

Summary

In sanitizer_platform_limits_posix.cc, for FreeBSD the
<netinet/ip_compat.h> header is included unconditionally. This does not
always work, as the header is not always installed, because it is only
used internally by ipfilter.

None of the code in sanitizer_platform_limits_posix.cc seems to use any
of the definitions in ip_compat.h, so can we please remove the include?

See also: https://svnweb.freebsd.org/changeset/base/277201

[emaste]

LGTM. If it turns out we do actually require something brought in by ip_compat.h we can find the correct header to include instead.

[dim]

Ping.

[samsonov]

I'm OK with this change as long as FreeBSD is not broken.

compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_limits_posix.cc

 # include <sys/statvfs.h>
 # include <sys/soundcard.h>
 # include <sys/mtio.h>
 # include <sys/consio.h>
 # include <sys/kbio.h>
 # include <sys/link_elf.h>
 # include <netinet/ip_mroute.h>
 # include <netinet/in.h>
-# include <netinet/ip_compat.h>
 # include <net/ethernet.h>
 # include <net/ppp_defs.h>
 # include <glob.h>
 # include <term.h>
 
 #define _KERNEL  // to declare 'shminfo' structure
 # include <sys/shm.h>
 #undef _KERNEL