[PATCH] git-svn fix for systems without strftime %z

Hi All,

In packaging the latest stable release for the OpenCSW project, I
found that some of the git-svn tests were failing.  After looking into
it, I saw that strftime calls were passing %z.  While %z is available
on most modern systems, it's not universal.  The forthcoming patch
implements a workaround for this that detects when %z falls through
and will insert the proper value when required.

I've tested this on both Linux and Solaris and it seems to behave as
expected (the test suite is happy on both).

I hope you find this useful.

Thanks
-Ben