Only build lld for llvm>18

Author: mcbarton

.github/workflows/ci.yml

@@ -390,7 +390,6 @@ jobs:
                 -DLLVM_ENABLE_TERMINFO=OFF                         \
                 -DLLVM_ENABLE_LIBXML2=OFF                          \
                 ../llvm
-          cmake --build . --target lld --parallel ${{ env.ncpus }}
           cmake --build . --target clang --parallel ${{ env.ncpus }}
           cmake --build . --target cling --parallel ${{ env.ncpus }}
           # Now build gtest.a and gtest_main for CppInterOp to run its tests.
@@ -415,7 +414,11 @@ jobs:
                 -DLLVM_ENABLE_TERMINFO=OFF                          \
                 -DLLVM_ENABLE_LIBXML2=OFF                           \
                 ../llvm
-          cmake --build . --target clang clang-repl lld --parallel ${{ env.ncpus }}
+          if [[ "${llvm_vers}" == "16" ]]||[[ "${llvm_vers}" == "17" ]]||[[ "${llvm_vers}" == "18" ]]; then
+            cmake --build . --target clang clang-repl --parallel ${{ env.ncpus }}
+          else
+            cmake --build . --target clang clang-repl lld --parallel ${{ env.ncpus }}
+          fi
         fi
         cd ../
         rm -rf $(find . -maxdepth 1 ! -name "build" ! -name "llvm" ! -name "clang" ! -name ".")