Sync with current OpenBSD stdio.

We'd fallen a little behind.

Bug: 14492135
Change-Id: Ic1137ef10bffccecebd5ce51086c23db006d0ea3
diff --git a/libc/Android.mk b/libc/Android.mk
index bcf546f..ff21d6a 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -673,6 +673,7 @@
     $(libc_common_cflags) \
     -I$(LOCAL_PATH)/upstream-openbsd/android/include \
     -I$(LOCAL_PATH)/upstream-openbsd/lib/libc/include \
+    -I$(LOCAL_PATH)/upstream-openbsd/lib/libc/gdtoa/ \
     -include openbsd-compat.h
 LOCAL_CONLYFLAGS := $(libc_common_conlyflags)
 LOCAL_CPPFLAGS := $(libc_common_cppflags)