Flagged Out-of-Date Comment: icu55

MarsSeed flagged icu55 out-of-date on 2024-02-29 (UTC) for the following reason:

Build this with gcc / g++, not clang(++), to align with how repo does it. Also currently check() fails: - in `icupkg': ICU Initialization returned: U_ZERO_ERROR \ Plugin file is: /usr/lib/icu/icuplugins55.txt \ ICU u_cleanup() called. - in 'testdata': gentest: unable to create data memory, U_FILE_ACCESS_ERROR