+ added promising _start and _initialize exports

rtl/wasi/si_dll.pp

@@ -48,6 +48,7 @@ end;
 {$endif}
 
 exports
-  _initialize;
+  _initialize,
+  _initialize name '_initialize_promising' promising;
 
 end.

rtl/wasi/si_prc.pp

@@ -48,6 +48,7 @@ end;
 {$endif}
 
 exports
-  _start;
+  _start,
+  _start name '_start_promising' promising;
 
 end.