INT 21 - DOS 2+ - "RMDIR" - REMOVE SUBDIRECTORY

	AH = 3Ah
	DS:DX -> ASCIZ pathname of directory to be removed
Return: CF clear if successful
	    AX destroyed
	CF set on error
	    AX = error code (03h,05h,06h,10h) (see #01680 at AH=59h/BX=0000h)
Notes:	directory must be empty (contain only '.' and '..' entries)
	under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
SeeAlso: AH=39h,AH=3Bh,AX=713Ah,AH=E2h/SF=0Bh,INT 2F/AX=1101h,INT 60/DI=0512h