Converts a string GUID into its binary encoding.
All string GUIDs are formatted as big endian but on-disk can be encoded in different ways.
guidstr |
a GUID, e.g. `00112233-4455-6677-8899-aabbccddeeff` |
guid |
a |
flags |
some fwupdguidflags, e.g. fwupd_guid_flag_mixed_endian |
true for success |