loader: remove unused static variable.

Author: rpavlik

src/loader/loader_core.cpp

@@ -43,9 +43,6 @@
 #include <utility>
 #include <vector>
 
-// Flag to cause the one time to init to only occur one time.
-std::once_flag g_one_time_init_flag;
-
 // Global lock to prevent reading JSON manifest files at the same time.
 static std::mutex g_loader_json_mutex;