(Merge 3.2) Issue #11277: mmap.mmap() calls fcntl(fd, F_FULLFSYNC) on Mac OS X

to get around a mmap bug with sparse files. Patch written by Steffen Daode
Nurpmeso.

diff --cc Misc/NEWS
index 39d3da4aee350ce04a616e1f0342d02cbb2e60d2,2a500949bc18fc81a79cf7a12bb4feb12a485be1..842b87b19c60eedb5b36364bbdff972480a97f30
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -132,9 -79,9 +132,12 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #11277: mmap.mmap() calls fcntl(fd, F_FULLFSYNC) on Mac OS X to get
+   around a mmap bug with sparse files. Patch written by Steffen Daode Nurpmeso.
+ 
 +- Issue #8407: Add signal.pthread_sigmask() function to fetch and/or change the
 +  signal mask of the calling thread.
 +
  - Issue #11858: configparser.ExtendedInterpolation expected lower-case section
    names.