[$] Case-insensitive filesystem lookups

Case-insensitive file name lookups are a feature that is fairly frequentlyraised at the Linux Storage, Filesystem, and Memory-Management Summit (LSFMM). At the 2018summit, Gabriel Krisman Bertazi proposed a new way to supportthe feature, though it met with a rather skeptical reception-with onenotable exception. Ted Ts'o seemed favorably disposed to the idea, in partbecause it would potentially be a way to get rid of some longstanding Android ugliness:wrapfs.