Check if clang SVN_REVISION is greater than 187409 before trying to use MicrosoftVFTableContext.

src/Parser/Parser.cpp

@@ -463,6 +463,7 @@ void Parser::WalkVTable(clang::CXXRecordDecl* RD, CppSharp::AST::Class^ C)
     {
     case TargetCXXABI::Microsoft:
     {
+#if SVN_REVISION >= 187409
         MicrosoftVFTableContext VTContext(*AST);
 
         auto VFPtrs = VTContext.getVFPtrOffsets(RD);
@@ -481,6 +482,7 @@ void Parser::WalkVTable(clang::CXXRecordDecl* RD, CppSharp::AST::Class^ C)
             C->Layout->VFTables->Add(Info);
             break;
         }
+#endif
     }
     case TargetCXXABI::GenericItanium:
     {