groonga http: revert select() before WSASend() and sendmsg()
groonga http: revert select() before WSASend() and sendmsg()

It doesn't fix the immediate shutdown problem. At lease WSASend()
blocks when internal send buffer doesn't have enough space for
the writing data. But select() detects writable on the situation.

komainu8/groonga,kenhys/groonga,groonga/groonga,komainu8/groonga,komainu8/groonga,groonga/groonga,groonga/groonga,kenhys/groonga,kenhys/groonga,groonga/groonga,komainu8/groonga,kenhys/groonga,komainu8/groonga,groonga/groonga,komainu8/groonga,komainu8/groonga,kenhys/groonga,groonga/groonga,komainu8/groonga,groonga/groonga,kenhys/groonga,groonga/groonga,kenhys/groonga,kenhys/groonga