Run thread-local static ctors and dtors on macOS

From the documentation on thread_attachThis
(https://dlang.org/phobos/core_thread.html#.thread_attachThis):

> NOTE:
> This routine does not run thread-local static constructors when
> called. If full functionality as a D thread is desired, the
> following function must be called after thread_attachThis:
>
> extern (C) void rt_moduleTlsCtor();

thread_detachThis
(https://dlang.org/phobos/core_thread.html#.thread_detachThis)
has a similar note about calling rt_moduleTlsDtor after
thread_detachThis.

This prevents bugs like the following:
SimonN/LixD#121

allegro5/system.d

@@ -24,14 +24,20 @@ else
 	}
 }
 
+extern (C) void rt_moduleTlsCtor();
+extern (C) void rt_moduleTlsDtor();
+
 int al_run_allegro(scope int delegate() user_main)
 {
 	extern(C) static int main_runner(int argc, char** argv)
 	{
 		version(OSX)
 		{
 			version(D_Version2)
+			{
 				thread_attachThis();
+				rt_moduleTlsCtor();
+			}
 			else
 				Thread.thread_attach();
 		}
@@ -41,7 +47,10 @@ int al_run_allegro(scope int delegate() user_main)
 		version(OSX)
 		{
 			version(D_Version2)
+			{
 				thread_detachThis();
+				rt_moduleTlsDtor();
+			}
 			else
 				Thread.thread_detach();
 		}