Fix Mac build.

Bug: N/A
Test: builds
Change-Id: Ia3dae9f86a0aaa5431929e790f5c36f8beaf3bed
diff --git a/tests/utils.h b/tests/utils.h
index e3e0b0d..81df350 100644
--- a/tests/utils.h
+++ b/tests/utils.h
@@ -19,7 +19,6 @@
 
 #include <inttypes.h>
 #include <sys/mman.h>
-#include <sys/sysmacros.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
@@ -46,6 +45,8 @@
 
 #if defined(__linux__)
 
+#include <sys/sysmacros.h>
+
 struct map_record {
   uintptr_t addr_start;
   uintptr_t addr_end;