Add Darwin ndk prebuilts

From android-ndk-r21d-darwin-x86_64.zip ef06c9f9d7efd6f243eb3c05ac440562ae29ae12

BUG: 159916003
Change-Id: Ia0089b9d4f50b5882f94d7fdc757172ec7371966
diff --git a/sysroot/usr/include/linux/socket.h b/sysroot/usr/include/linux/socket.h
new file mode 100644
index 0000000..608d31f
--- /dev/null
+++ b/sysroot/usr/include/linux/socket.h
@@ -0,0 +1,32 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _UAPI_LINUX_SOCKET_H
+#define _UAPI_LINUX_SOCKET_H
+#define _K_SS_MAXSIZE 128
+typedef unsigned short __kernel_sa_family_t;
+struct sockaddr_storage {
+  union {
+    struct {
+      __kernel_sa_family_t ss_family;
+      char __data[_K_SS_MAXSIZE - sizeof(unsigned short)];
+    };
+    void * __align;
+  };
+};
+#endif