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

* commit 'e6e2ba1d40241c85de16d75cbd397cc3670d7535':
  libc: <pthread.h>: Replace '#if __cplusplus' by '#ifdef __cplusplus'