relative jumps now work with instructions that add multiple entries (including plug-in calls)

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@3670 212acab6-be3b-0410-9dea-997c60f758d6

Source/script.cpp

@@ -804,6 +804,8 @@ int CEXEBuild::doCommand(int which_token, LineParser &line)
   build_plugin_table();
 #endif
 
+  multiple_entries_instruction=0;
+
   entry ent={0,};
   switch (which_token)
   {