Fix bug 231273 - [windows] os.popen doens't kill subprocess when interrupted

Don't pass CREATE_NEW_CONSOLE to CreateProcess(), meaning our child process is in the same "console group" and therefore interrupted by the same Ctrl+C that interrupts the parent.

Modules/posixmodule.c

@@ -3291,7 +3291,7 @@ _PyPopenCreateProcess(char *cmdstring,
 			  NULL,
 			  NULL,
 			  TRUE,
-			  CREATE_NEW_CONSOLE,
+			  0, /* no new console so Ctrl+C kills child too */
 			  NULL,
 			  NULL,
 			  &siStartInfo,