gcc-wrapper: Add warning for dir.c:43

Change bde4ec0140fadc028d22c8959347fb8d0f501b84 consolidated
warnings generated from several toolchains, but forgot this one.

Change-Id: I4ab67610962572371cefedace30bb2e89b818c12
Signed-off-by: Michael Bohan <mbohan@codeaurora.org>
(cherry picked from commit c630d473862bfaad8e3a1ab7e7a5f454d49087a7)