lief: silence error log spam

Since 0.15, the error logs got very chatty (search for `LIEF_ERR` in
its code base).
E.g. the following log appears tens of thousands of times for an
unsupported architecture:

    LIEF does not support relocation for 'ARC_COMPACT'

There are no logs for `CRITICAL` level, so there is nothing much we
can do besides turning of logging.

unblob/handlers/executable/elf.py

@@ -19,7 +19,7 @@
 )
 from unblob.models import HexString, StructHandler, ValidChunk
 
-lief.logging.set_level(lief.logging.LEVEL.ERROR)
+lief.logging.disable()
 
 logger = get_logger()