Add SYSTEM target property

daquexianrequested to merge
daquexian/cmake:add_SYSTEM_prop into master

This MR adds a SYSTEM property on target (step 1 of #18040 (comment 1197146)). If SYSTEM is ON, the INTERFACE_INCLUDE_DIRECTORIES will be treated as system include directories.

Issue: #18040 (closed)

Edited by Brad King

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