ICU-22264 Add -fsanitize=cfi-icall

[FrankYFTang]

Add -fsanitize=cfi-icall to the CFI build

Checklist

• [X] Required: Issue filed: https://unicode-org.atlassian.net/browse/ICU-22264
• [X] Required: The PR title must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• [X] Required: The PR description must include the link to the Jira Issue, for example by completing the URL in the first checklist item
• [X] Required: Each commit message must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• [X] Issue accepted (done by Technical Committee after discussion)
• [ ] Tests included, if applicable
• [ ] API docs and/or User Guide docs changed or added, if applicable

[richgillam]

@FrankYFTang @markusicu Is this still in process? Who's an appropriate reviewer?

[markusicu]

the clang-cfi check fails...

[markusicu]

the clang-cfi check fails...

@FrankYFTang can you finish this by next Wed feb12 for ICU 77?