[Makefile] Make static-analysis depend on iwyu

Florian Schmaus requested to merge flow/emper:makefile-iwyu into master

The ninja 'iwyu' target does not depend nor generates compile_commands_wo_subprojects/compile_commands.json. Hence iwyu would fail if the database is not yet generated or run with an outdated compile_commands.json.

Instead of iwyu being added to STATIC_ANALYSIS_NINJA_TARGETS, we now have the static-analysis make target depend on iwyu. This ensures that compile_commands_wo_subprojects/compile_commands.json is generated or updated (if required) before iwyu is run.p

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