Don't remove singletons during shutdown

Signed-off-by: Sinan Kaya <sinan.kaya@microsoft.com>

src/winhttppal.cpp

@@ -575,8 +575,8 @@ void ComContainer::FreeCURL(CURL *ptr)
 
 ComContainer &ComContainer::GetInstance()
 {
-    static ComContainer the_instance;
-    return the_instance;
+    static ComContainer *the_instance = new ComContainer();
+    return *the_instance;
 }
 
 void ComContainer::ResumeTransfer(CURL *handle, int bitmask)

src/winhttppal_imp.h

@@ -497,8 +497,8 @@ class WinHttpHandleContainer
 public:
     static WinHttpHandleContainer &Instance()
     {
-        static WinHttpHandleContainer the_instance;
-        return the_instance;
+        static WinHttpHandleContainer *the_instance = new WinHttpHandleContainer<T>();
+        return *the_instance;
     }
 
     void UnRegister(T *val);