[NaCl SDK] Change the kernel_wrap OS #ifdefs in nacl_mounts.

native_client_sdk/src/libraries/nacl_mounts/kernel_wrap_newlib.cc

Index: native_client_sdk/src/libraries/nacl_mounts/kernel_wrap_newlib.cc
diff --git a/native_client_sdk/src/libraries/nacl_mounts/kernel_wrap_newlib.cc b/native_client_sdk/src/libraries/nacl_mounts/kernel_wrap_newlib.cc
index d4cb61869c267824f35eda965a727105f94ffc8f..57cbdb34feb0463ce90558c815c80533113a1ae2 100644
--- a/native_client_sdk/src/libraries/nacl_mounts/kernel_wrap_newlib.cc
+++ b/native_client_sdk/src/libraries/nacl_mounts/kernel_wrap_newlib.cc
@@ -3,6 +3,12 @@
  * found in the LICENSE file.
  */
 
+#include <sys/types.h>  // Include something that will define __GLIBC__.
+
+// The entire file is wrapped in this #if. We do this so this .cc file can be
+// compiled, even on a non-newlib build.
+#if defined(__native_client__) && !defined(__GLIBC__)
+
 #include "nacl_mounts/kernel_wrap.h"
 #include <dirent.h>
 #include <errno.h>
@@ -161,3 +167,5 @@ static struct NaClMountsStaticInitializer {
     DO_WRAP(filename, stat);
   }
 } nacl_mounts_static_initializer;
+
+#endif  // defined(__native_client__) && !defined(__GLIBC__)