Add OpenFileMapping method to Win32 Kernel

[magneticflux-]

Kernel32::CreateFileMapping exists, but Kernel32::OpenFileMapping does not. This is more confusing because Kernel32::MapViewOfFile mentions OpenFileMapping in its Javadocs here:

jna/contrib/platform/src/com/sun/jna/platform/win32/Kernel32.java

Lines 1052 to 1054 in b8bdacb

	* @param hFileMappingObject
	* A handle to a file mapping object. The CreateFileMapping and
	* OpenFileMapping functions return this handle.

I believe the signature should be this:

HANDLE OpenFileMapping(WinBase.SECURITY_ATTRIBUTES lpAttributes,
        boolean bInheritHandle, String lpName);

derived from the specs here.

[matthiasblaesing]

Fix was merged to master