'git status -z' missing separators on OSX

[Tad Hardesty <tad@platymuus.com>]

I have been experiencing a problem where git on OSX prints incorrect
output to the `git status -z` command, where instead of NUL separators
records are simply not separated. This is causing problems with IDE
integration. While I have a workaround involving manually replacing \n
with \0, it would be nice to identify and fix the root issue.

Here's a terminal session showing the problem:
~$ mkdir test && cd test
~/test$ git init
Initialized empty Git repository in /Users/thardesty/test/.git/
~/test (master #)$ touch a b
~/test (master #)$ ls
a b
~/test (master #)$ git status -z | hexdump -C
00000000  3f 3f 20 61 3f 3f 20 62                           |?? a?? b|
00000008
~/test (master #)$ git add a b
~/test (master #)$ git status -z | hexdump -C
00000000  41 20 20 61 41 20 20 62                           |A  aA  b|
00000008
~/test (master #)$ git status --porcelain | hexdump -C
00000000  41 20 20 61 0a 41 20 20  62 0a                    |A  a.A  b.|
0000000a
~/test (master #)$ git --version
git version 2.4.3
~/test (master #)$ uname -a
Darwin HA002070 14.3.0 Darwin Kernel Version 14.3.0: Mon Mar 23 11:59:05
PDT 2015; root:xnu-2782.20.48~5/RELEASE_X86_64 x86_64

As shown, --porcelain prints a newline but -z yields no separator at all.

The Mac is running OS X Yosemite 10.10.3. I have tried git 2.3.2 from
Apple, git 2.4.2 from brew, and git 2.4.3 from brew, git-scm.org, and
self-compiled, and these all exhibit the problem. Some helpful folks on
the #git IRC tried the commands for me and didn't see any problems, but
I temporarily blanked all my configuration files and that didn't help. I
double-checked and git on Linux has the correct behavior.

Thanks for any help.