+ call InitSystemThreads in the system unit startup for WASI

git-svn-id: branches/wasm@48313 -

rtl/wasi/system.pp

@@ -348,4 +348,7 @@ begin
   SysInitStdIO;
   { Reset IO Error }
   InOutRes:=0;
+{$ifdef FPC_HAS_FEATURE_THREADING}
+  InitSystemThreads;
+{$endif}
 end.