+ add the "-m wasm32" parameter to the linker, when linking for the WASI

  target. No idea if it does anything, but is passed to the linker by the
  official WASI SDK, so it shouldn't hurt.

compiler/systems/t_wasi.pas

@@ -96,8 +96,8 @@ procedure tlinkerwasi.SetDefaultInfo;
 begin
   with Info do
     begin
-      ExeCmd[1] := 'wasm-ld $SONAME $GCSECTIONS $MAP -o $EXE';
-      DllCmd[1] := 'wasm-ld $SONAME $GCSECTIONS $MAP -o $EXE';
+      ExeCmd[1] := 'wasm-ld -m wasm32 $SONAME $GCSECTIONS $MAP -o $EXE';
+      DllCmd[1] := 'wasm-ld -m wasm32 $SONAME $GCSECTIONS $MAP -o $EXE';
     end;
 end;