staging: vboxsf: Remove unused including <linux/version.h>

Remove including <linux/version.h> that don't need it.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20191107015923.100013-1-yuehaibing@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vboxsf/vfsmod.h

@@ -10,7 +10,6 @@
 
 #include <linux/backing-dev.h>
 #include <linux/idr.h>
-#include <linux/version.h>
 #include "shfl_hostintf.h"
 
 #define DIR_BUFFER_SIZE SZ_16K