[Msan] Fix msan_test.cc inclusions to build the unit tests on FreeBSD

[eugenis]

LGTM

lib/msan/tests/msan_test.cc

 #include "sanitizer/msan_interface.h"
 
 #include <inttypes.h>
 #include <stdlib.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <wchar.h>
 #include <math.h>
-#include <malloc.h>
 
 #include <arpa/inet.h>
 #include <dlfcn.h>
 #include <grp.h>
 #include <unistd.h>
 #include <link.h>
 #include <limits.h>
 #include <sys/time.h>
 #include <poll.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <sys/resource.h>
 #include <sys/ioctl.h>
 #include <sys/statvfs.h>
-#include <sys/sysinfo.h>
 #include <sys/utsname.h>
 #include <sys/mman.h>
-#include <sys/vfs.h>
 #include <dirent.h>
 #include <pwd.h>
 #include <sys/socket.h>
 #include <netdb.h>
 #include <wordexp.h>
-#include <mntent.h>
-#include <netinet/ether.h>
 #include <sys/ipc.h>
 #include <sys/shm.h>
 
+#if !defined(__FreeBSD__)
+# include <malloc.h>
+# include <sys/sysinfo.h>
+# include <sys/vfs.h>
+# include <mntent.h>
+# include <netinet/ether.h>
+#else
+# include <netinet/in.h>
+#endif
+
 #if defined(__i386__) || defined(__x86_64__)
 # include <emmintrin.h>
 # define MSAN_HAS_M128 1
 #else
 # define MSAN_HAS_M128 0
 #endif
 
 #ifdef __AVX2__
TEST(MemorySanitizer, recvmsg) {
   res = bind(client_socket, (struct sockaddr *)&client_sai, sizeof(client_sai));
   ASSERT_EQ(0, res);
 
   sz = sizeof(client_sai);
   res = getsockname(client_socket, (struct sockaddr *)&client_sai, &sz);
   ASSERT_EQ(0, res);
   ASSERT_EQ(sizeof(client_sai), sz);
 
-  
   const char *s = "message text";
   struct iovec iov;
   iov.iov_base = (void *)s;
   iov.iov_len = strlen(s) + 1;
   struct msghdr msg;
   memset(&msg, 0, sizeof(msg));
   msg.msg_name = &sai;
   msg.msg_namelen = sizeof(sai);