These ones still remain, I needed only the extract part so didn't dig in further:
mksquashfs.c:1590:2: warning: implicit declaration of function ‘dir_scan2’; did you mean ‘dir_scan’? [-Wimplicit-function-declaration]
mksquashfs.c:1559:2: warning: implicit declaration of function ‘dir_scan2’; did you mean ‘dir_scan’? [-Wimplicit-function-declaration]
mksquashfs.c:2428:2: warning: implicit declaration of function ‘dir_scan2’; did you mean ‘dir_scan’? [-Wimplicit-function-declaration]
squashfs/mksquashfs.c:1308:12: warning: implicit declaration of function ‘devtable_readdir’; did you mean ‘linux_readdir’? [-Wimplicit-function-declaration]
These ones still remain, I needed only the extract part so didn't dig in further: