fix to work 07netcat.strm on windows

[mattn]

I modifed order of streming in 07netcat.strm because windows can't poll stdin in non-main thread. it should poll input with ReadConsoleInput or ReadFile. So this is a temporary workaround .

[mattn]

testing with 06echo.strm, 07netcat.strm on windows,

(1) typing some letters on console that running 06echo.strm
(2) seems receiving characters in 07netcat.strm, and maybe replying same value
(3) nothing output on console. (BUG)

This is last remaining issue on windows.

[mattn]

one more issue. in sometimes assertion occured.

Assertion failed!

Program: C:\dev\streem\bin\streem.exe
File: value.c, Line 81

Expression: strm_value_tag(v) == STRM_TAG_FOREIGN

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.