fs/unicode patches for 5.4-rc1

This includes two fixes for the unicode system for inclusion into Linux
v5.4.

  - A patch from Krzysztof Wilczynski solving a build time warning.

  - A patch from Colin King making a parsing format static, to reduce
    stack size.

Build validated and run time tested using xfstests casefold testcase.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
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