MFC 205021:

MFC 205021:
- Use an initializer macro to initialize fields in 'fake' FILE objects used
  by *sprintf(), etc.
- Explicitly initialize _fl_mutex to PTHREAD_MUTEX_INITIALIZER for all FILE
  objects.  This is currently a nop on FreeBSD, but is import for other
  platforms (or in the future) where PTHREAD_MUTEX_INITIALIZER is not simply
  zero.

git-svn-id: svn://svn.freebsd.org/base/stable/8@213720 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f