Build libLLVMlto on non-Darwin architectures. Resolves PR1055: http://llvm.org/PR1055

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33006 91177308-0d34-0410-b5e6-96231b3b80d8

tools/lto/lto.cpp

@@ -455,6 +455,9 @@ LTO::optimizeModules(const std::string &OutputFilename,
   return LTO_OPT_SUCCESS;
 }
 
+/// Unused pure-virtual destructor. Must remain empty.
+LinkTimeOptimizer::~LinkTimeOptimizer() {}
+
 /// Destruct LTO. Delete all modules, symbols and target.
 LTO::~LTO() {