Before previous commit, compiling with gcc8 would have need:
-Wno-error=format-overflow -Wno-error=format-security

But now, only -Wno-error=format-truncation is needed.

rationale:
gcc bogusly complains about snprintf() being unsafe. See:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77721
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78969

Let mount uses the blkid library for guessing the filesystem type
That's quite a lot better than manually trying a long list of potential
fses

now that we've it in stage1 anyway (since using dracut)

eg: "method:disk,disk:vdb,partition:vdb1,dir:/Mageia/boot.iso"

in the future, we might want to merge back !automatic & automatic paths