fstools: backport fixes from master branch

fstools: backport fixes from master branch

The following changes are backported from the master branch

bdcb075 libfstools: fix matching device name
(f038a61 on master)

ef2d438 fstools: use -Wno-format-truncation instead of -Wno-error=format-truncation
(c43ae11 on master)

d361923 build: disable the format-truncation warning error to fix gcc 7 build errors
(a19f2b3 on master)

cddc830 libfstools: silence mkfs.{ext4,f2fs}
(88d48d5 on master)

be5004c libfstools: add basic documentation of mount functions
(92b4c2c on master)

34d36c2 add missing includes
(7d78836 on master)

A previously added hotfix was replaced by a git commit, hence the patch
file is removed and we got instead

45c2a6f libfstools: fix multiple volume_identify usages with the same volume
(633a8d0 on master)

Signed-off-by: Daniel Golle <daniel@makrotopia.org>