fix for posix_fsync under SunOS 4.1.x

[Guido van Rossum]

> Here's a patch to make sure that posix_fsync will compile on all operating
> systems (specifically needed for SunOS 4.1.x).
> 
> This unified diff was made against Python 1.5.2 beta 2 .
> 
> -scott
> 
> --- Modules/posixmodule.c~	Tue Feb 16 11:38:04 1999
> +++ Modules/posixmodule.c	Fri Apr  2 22:18:03 1999
> @@ -647,6 +647,8 @@
>  "fsync(fildes) -> None\n\
>  force write of file with filedescriptor to disk.";
>  
> +extern int fsync(int); /* Prototype just in case */
> +
>  static PyObject *
>  posix_fsync(self, args)
>         PyObject *self;

On how many other operating systems have you tried this patch?  I have
found that almost invariably when you use an extern declaration of a
standard function that is defined in the system headers on most modern
systems, there's at least one system out there where what they have in
the headers causes a conflict with what you declare!  It would be
better if you put it insude an #ifdef specific for the SunOS 4.x
platform.

--Guido van Rossum (home page: http://www.python.org/~guido/)