unionfs-fuse: upgarde 3.4 -> 3.7

License-Update: copyright year bump

Drop patch which became unneeded (CFLAGS are not overwritten anymore)

Selected shortlog (without readme and CI changes):
- Use fchmodat with AT_SYMLINK_NOFOLLOW if available
- Use utimensat on macOS
- tests: properly test for directory existence using os.path.isdir
- Enable commented test for rmdir
- Add more tests for renaming using cow
- Allow directory renaming when cow is disabled but it only exists in one branch
- Use existing function for checking if file exists
- Fix directory rename hiding files from lower branches
- remove deprecated "use_ino" option from examples and documentation
- CMake: Support CFLAGS= and -DCMAKE_C_FLAGS= from the outside
- set -D_FILE_OFFSET_BITS=64 unconditionally so that compilation does not fail on 32bit systems

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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