[OpenMP] Use "standalone" include path if clang is not being built #143405
+2
−2
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If clang is not being built as part of this build, install headers into
include
rather thanlib/clang/21/include
(the latter, in clanglessbuilds, will not be automatically included in search paths).
This, combined with #143390 , allows builds that include OpenMP but not
clang to build successfully.