build: simplify the ICU include handling #29479
Merged
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This simplifies the ICU flags handling. This inlines the use into just
the library case, as the ICU usage is for the standard library targets
only. It uses CMake to properly add the include paths as a system
search path. This should fix the Linux builds as the include flags were
being de-duplicated as we are now using CMake more than we were
previously.
Replace this paragraph with a description of your changes and rationale. Provide links to external references/discussions if appropriate.
Resolves SR-NNNN.