win32.h (_Jv_platform_close_on_exec): Changed signature and declared extern.

win32.h (_Jv_platform_close_on_exec): Changed signature and declared extern.

	* include/win32.h (_Jv_platform_close_on_exec): Changed
	signature and declared extern.
	* win32.cc (_Jv_platform_close_on_exec): Implemented.
	* gnu/java/net/natPlainDatagramSocketImplWin32.cc
	(create): Use new signature of _Jv_platform_close_on_exec.
	* gnu/java/net/natPlainSocketImplWin32.cc
	(create): Eliminated a few typecasts
	Use new signature of _Jv_platform_close_on_exec.
	(accept): Eliminated a few typecasts
	Use new signature of _Jv_platform_close_on_exec.
	* java/io/natFileDescriptorWin32.cc (open): Use
	_Jv_platform_close_on_exec.

From-SVN: r73325