Use `SRWLOCK_INIT` to statically initialize `stl_critical_section_win7::m_srw_lock` (#3522)

stl/src/primitives.hpp

@@ -30,9 +30,7 @@ namespace Concurrency {
 
         class stl_critical_section_win7 final : public stl_critical_section_interface {
         public:
-            stl_critical_section_win7() {
-                InitializeSRWLock(&m_srw_lock);
-            }
+            stl_critical_section_win7() = default;
 
             ~stl_critical_section_win7()                                           = delete;
             stl_critical_section_win7(const stl_critical_section_win7&)            = delete;
@@ -62,7 +60,7 @@ namespace Concurrency {
             }
 
         private:
-            SRWLOCK m_srw_lock;
+            SRWLOCK m_srw_lock = SRWLOCK_INIT;
         };
 
         class stl_condition_variable_win7 final : public stl_condition_variable_interface {