Add a hack to force the linker to fetch Object.o

Author: cixtor

src/rustllvm/RustWrapper.cpp

@@ -29,3 +29,5 @@ extern "C" const char *LLVMRustGetLastError(void) {
   return LLVMRustError;
 }
 
+LLVMOpaqueObjectFile* (*RustHackToFetchObjectO)(LLVMOpaqueMemoryBuffer*)
+  = LLVMCreateObjectFile;