am b299039d: am e6e2ba1d: Merge "libc: <pthread.h>: Replace \'#if __cplusplus\' by \'#ifdef __cplusplus\'"

* commit 'b299039d060eb5f523c05e4f9b6934a6b897a54f':
  libc: <pthread.h>: Replace '#if __cplusplus' by '#ifdef __cplusplus'