MacOS LLVM only requires -L for libzstd

[nickg]

Another attempt at fixing #1043.

[jeisch]

configure output looks good, no warnings and the arguments look as expected:

configure:10371: checking for LLVM (engine passes ipo linker native)
configure:10394: g++ -std=gnu++11 -o conftest -g -O2 -I/opt/local/libexec/llvm-16/include -std=c++17 -stdlib=libc++ -fno-exceptions -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -L/opt/local/libexec/llvm-16/lib -Wl,-search_paths_first -Wl,-headerpad_max_install_names -L/opt/local/lib conftest.cpp -lLLVMX86TargetMCA -lLLVMMCA -lLLVMX86Disassembler -lLLVMX86AsmParser -lLLVMX86CodeGen -lLLVMCFGuard -lLLVMGlobalISel -lLLVMX86Desc -lLLVMX86Info -lLLVMMCDisassembler -lLLVMSelectionDAG -lLLVMAsmPrinter -lLLVMPasses -lLLVMIRPrinter -lLLVMCoroutines -lLLVMipo -lLLVMInstrumentation -lLLVMVectorize -lLLVMLinker -lLLVMFrontendOpenMP -lLLVMInterpreter -lLLVMExecutionEngine -lLLVMRuntimeDyld -lLLVMOrcTargetProcess -lLLVMOrcShared -lLLVMCodeGen -lLLVMTarget -lLLVMScalarOpts -lLLVMInstCombine -lLLVMAggressiveInstCombine -lLLVMObjCARCOpts -lLLVMTransformUtils -lLLVMBitWriter -lLLVMAnalysis -lLLVMProfileData -lLLVMSymbolize -lLLVMDebugInfoPDB -lLLVMDebugInfoMSF -lLLVMDebugInfoDWARF -lLLVMObject -lLLVMTextAPI -lLLVMMCParser -lLLVMIRReader -lLLVMAsmParser -lLLVMMC -lLLVMDebugInfoCodeView -lLLVMBitReader -lLLVMCore -lLLVMRemarks -lLLVMBitstreamReader -lLLVMBinaryFormat -lLLVMTargetParser -lLLVMSupport -lLLVMDemangle -lm -lz -lzstd -lcurses -lxml2 >&5
configure:10394: $? = 0
configure:10411: result: yes

[nickg]

Great, thanks for testing.