Keep os/android-os.h compiling now we have __key in <sys/ipc.h>. am: 61e00348b1 am: c0df2e6737 am: bef3b0ed6e
am: cf41806599

Change-Id: I419b3f50f6734c42d44caa12b0630f92ad3cd9e4
diff --git a/os/os-android.h b/os/os-android.h
index c002509..96ff5ba 100644
--- a/os/os-android.h
+++ b/os/os-android.h
@@ -62,6 +62,7 @@
 #define SHM_HUGETLB    04000
 
 #define shmid_ds shmid64_ds
+#undef __key
 
 #include <stdio.h>
 #include <linux/ashmem.h>