Fix some pthread symbols build as C++ symbol under x64 lunch.

Functions protected with !defined(__LP64__) will be get build as C++
symbols for X64 build. This is not the desired work. So protect the
implementation with !defined(__LP64__) as well.

Change-Id: I4ef50ec36e46289ab308063e24f6c5ac61a6ca8d
2 files changed