Mention the POSIX header tests in docs/status.md.

Also add a couple of comments in the tests for ease of understanding
when grepping for `__BIONIC__`.

Bug: N/A
Test: N/A
Change-Id: I7833a3ffbcc3badf9cec95f268d11a6d8a5ff9aa
diff --git a/tests/headers/posix/dirent_h.c b/tests/headers/posix/dirent_h.c
index 6c61c8d..4ce0f18 100644
--- a/tests/headers/posix/dirent_h.c
+++ b/tests/headers/posix/dirent_h.c
@@ -34,8 +34,8 @@
   INCOMPLETE_TYPE(DIR);
 
   TYPE(struct dirent);
-#if defined(__BIONIC__) && !defined(__LP64__)
-  STRUCT_MEMBER(struct dirent, uint64_t, d_ino); // Historical ABI accident.
+#if defined(__BIONIC__) && !defined(__LP64__) // Historical ABI accident.
+  STRUCT_MEMBER(struct dirent, uint64_t, d_ino);
 #else
   STRUCT_MEMBER(struct dirent, ino_t, d_ino);
 #endif