Include <sys/sysmacros.h> for major/minor/makedev.

glibc and bionic are both moving away from having <sys/types.h> pull in
<sys/sysmacros.h>.

Bug: https://github.com/android-ndk/ndk/issues/398
Test: builds
Change-Id: I5c4ae7f9320e671bc154a59cde42dad4dab12f29
diff --git a/common/test_utils.cc b/common/test_utils.cc
index dfdc6b8..fb22c80 100644
--- a/common/test_utils.cc
+++ b/common/test_utils.cc
@@ -25,6 +25,7 @@
 #include <stdlib.h>
 #include <sys/ioctl.h>
 #include <sys/stat.h>
+#include <sys/sysmacros.h>
 #include <sys/types.h>
 #include <sys/xattr.h>
 #include <unistd.h>