Run git-daemon on windows without closing socket immediately.

git client had exit with 'read error' some time, if connected git-daemon
on windows. The cause was that git-daemon close socket immediately.
I fixed this problem.
Here is detail the explanation.

https://github.com/toshiyuki-ogawa/msysgit/wiki/A-consideration-of--'fatal:-read-error-(invalid-argument)'

Signed-off-by: Toshiyuki Ogawa <Toshiyuki.Ogawa.2.71@gmail.com>