string literals in efi_loader code

[AKASHI Takahiro]

Heinrich,

You started to use u"..." literals in efi_loader code in
commit 99bfab8b5832("efi_loader: identify PK, KEK, db, dbx correctly"),
but there are still lots of L"..." literals seen.
Do you want to replace all the 'L' to 'u'?
I think that mixing both usages would cause confusion.
What is your policy?
(I know -fshort-wchar is still on in Makefile.)

-Takahiro Akashi