[LLVM] Fail if LLVM_ENABLE_ZSTD is FORCE_ON but static zstd libraries are not found
#15924
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Currently, if we pass
LLVM_USE_STATIC_ZSTD=ONandLLVM_ENABLE_ZSTD=FORCE_ON, we silently ignore zstd and proceed to build the compiler.With
LLVM_ENABLE_ZSTD=FORCE_ON, we should throw an error instead.Thanks @tcreech-intel for find this.