lli/RemoteMemoryManager.cpp: Resurrect __main stuff removed in r192504 to unbreak mingw32.

llvm-svn: 193472
diff --git a/llvm/tools/lli/RemoteMemoryManager.h b/llvm/tools/lli/RemoteMemoryManager.h
index 5d0456f..3368b30 100644
--- a/llvm/tools/lli/RemoteMemoryManager.h
+++ b/llvm/tools/lli/RemoteMemoryManager.h
@@ -78,7 +78,7 @@
   // interface does support this, but clients must provide their own
   // mechanism for finding remote symbol addresses.  MCJIT will resolve
   // symbols from Modules it contains.
-  uint64_t getSymbolAddress(const std::string &Name) { return 0; }
+  uint64_t getSymbolAddress(const std::string &Name);
 
   void notifyObjectLoaded(ExecutionEngine *EE, const ObjectImage *Obj);