build: treat ICU includes as system headers #6219
Merged
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Replace this paragraph with a description of your changes and rationale. Provide links to external references/discussions if appropriate.
Resolves SR-NNNN.
These headers should be treated as system headers as we do not control them.
Use target_include_directories so that we can use the
SYSTEM
option toindicate that they are system headers. It also simplifies the invocation by not
directly modifying the underlying property.