MSC: unsigned _dos_setfileattr( char *path, unsigned attr )

	- prototype in dos.h

	- path = valid DOS file name
	- attr	= file attribute (logical OR of the following):
		= _A_ARCH
		= _A_HIDDEN
		= _A_NORMAL
		= _A_RDONLY
		= _A_SUBDIR
		= _A_SYSTEM
		= _A_VOLID

	- returns 0 on success or DOS error code on failure

	- see	INT 21,43   _dos_getfileattr()