Classic extSdCard mounts

Hopefully fix apps like doubletwist that have ample complaints in theor forums, but not not done anytning for 4.2/4.3 filesystems

ps2: only add /mnt/extSdcard symlink if /storage/sdcard1 exists

Change-Id: I8cb70c85407411133a211e91ae14801aa53c961d
Signed-off-by: nuclearmistake <nuclearmistake@gmail.com>