Make the link order of foreign imports deterministic

src/llvm_backend.hpp

@@ -135,7 +135,6 @@ struct lbModule {
 	u32 nested_type_name_guid;
 
 	Array<lbProcedure *> procedures_to_generate;
-	Array<String> foreign_library_paths;
 
 	lbProcedure *curr_procedure;
 
@@ -162,6 +161,10 @@ struct lbGenerator {
 
 	PtrMap<Ast *, lbProcedure *> anonymous_proc_lits; 
 
+	BlockingMutex foreign_mutex;
+	PtrSet<Entity *> foreign_libraries_set;
+	Array<Entity *>  foreign_libraries;
+
 	std::atomic<u32> global_array_index;
 	std::atomic<u32> global_generated_index;
 };