Plumbing though mode parameter to open, since fusefs can make use of it.

native_client_sdk/src/libraries/nacl_io/kernel_wrap_glibc.cc

Index: native_client_sdk/src/libraries/nacl_io/kernel_wrap_glibc.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/kernel_wrap_glibc.cc b/native_client_sdk/src/libraries/nacl_io/kernel_wrap_glibc.cc
index 0cc3e9045fddc6e1cc4a02b7bd3fec372c3d232c..eb5c32a5ac502d059931eaa1e3a42d42d5cd8172 100644
--- a/native_client_sdk/src/libraries/nacl_io/kernel_wrap_glibc.cc
+++ b/native_client_sdk/src/libraries/nacl_io/kernel_wrap_glibc.cc
@@ -273,7 +273,7 @@ int WRAP(munmap)(void* addr, size_t length) {
 }
 
 int WRAP(open)(const char* pathname, int oflag, mode_t cmode, int* newfd) {
-  *newfd = ki_open(pathname, oflag);
+  *newfd = ki_open(pathname, oflag, cmode);
   RTN_ERRNO_IF(*newfd < 0);
   return 0;
 }