Issues linking with LLVM 18 in 1.13.9.0

[etsach]

Problem

Expected behavior: Build OSL library with LLVM 18

Actual behavior: oslc fails to link with undefined references such as:

/usr/bin/ld: ../../lib/liboslcomp.so.1.13.9: undefined reference to clang::api_notes::APINotesManager::APINotesManager(clang::SourceManager&, clang::LangOptions const&)' We might just need -lclangAPINotes with LLVM 18

Steps to Reproduce

1. cmake .. -DCMAKE_CXX_STANDARD=17
2. make -j8

Versions

• OSL branch/version: 1.13.9.0 release
• OS: Ubuntu 24.04 LTS
• C++ compiler: clang 18.1.3 (Ubuntu 24.04 package)
• LLVM version: 18.0 (Ubuntu 24.04 package)
• OIIO version: 2.4.17 (Ubuntu 24.04 package)

[lgritz]

Proposed fix in #1812