[NaCl SDK] nacl_io: Remove unneeded glibc syscall entry points.

native_client_sdk/src/libraries/nacl_io/syscalls/getcwd.c

Index: native_client_sdk/src/libraries/nacl_io/syscalls/getcwd.c
diff --git a/native_client_sdk/src/libraries/nacl_io/syscalls/getcwd.c b/native_client_sdk/src/libraries/nacl_io/syscalls/getcwd.c
index aff35d85441c20c4f2540885369f374cc7608fdc..5e702ca381536855fa87612d3435ad0d37a3146a 100644
--- a/native_client_sdk/src/libraries/nacl_io/syscalls/getcwd.c
+++ b/native_client_sdk/src/libraries/nacl_io/syscalls/getcwd.c
@@ -8,6 +8,12 @@
 #include "nacl_io/kernel_intercept.h"
 #include "nacl_io/kernel_wrap.h"
 
+/*
+ * This interception should not really be needed under glibc since we can
+ * hook the internal calls to getcwd.  However, we need to intercept it here
+ * since gtest call getcwd in a static constructor which general runs before
+ * nacl_io is initiliased.
+ */
 char* getcwd(char* buf, size_t size) {
   // If size is 0, allocate as much as we need.
   if (size == 0) {