remove unnecessary line

Author: hectorchu

builder/build.go

@@ -854,7 +854,6 @@ func Build(pkgName, outpath, tmpdir string, config *compileopts.Config) (BuildRe
 				for _, name := range []string{"malloc", "calloc", "free"} {
 					if fn := mod.NamedFunction(name); !fn.IsNil() {
 						fn2 := llvm.AddFunction(mod, "__"+name, fn.Type())
-						fn2.SetLinkage(llvm.ExternalLinkage)
 						fn.ReplaceAllUsesWith(fn2)
 						fn.EraseFromParentAsFunction()
 						fn2.SetName(name)