Generate correct debugger symbol tables for nested struct types.

Previously, when a struct type first appeared in a symbol table nested within another struct type, subsequent references to that type would use the wrong offset and be corrupted. This occurred because the symbol table length had not yet been updated to reflect the size of the entry for the outer structure at the time the inner one was processed.

Fixes #54.

Symbol.pas

@@ -849,6 +849,8 @@ var
    {    ip - identifier to generate				}
    {    storage - storage type; none for struct/union fields	}
 
+   label 1;
+
    var
       disp: integer;			{disp to symbol of same type}
 
@@ -1108,7 +1110,11 @@ var
                         if disp = noDisp then begin
         		   CnOut(12);
         		   CnOut2(0);
+                           		{update length of symbol table before  }
+                           		{handling any nested struct definitions}
+                           symLength := symLength+12;
                            ExpandStructType(ip^.itype);
+                           goto 1;
                            end {if}
                         else begin
         		   CnOut(13);
@@ -1117,7 +1123,7 @@ var
                         end;
          end; {case}
       symLength := symLength+12;	{update length of symbol table}
-      end; {if}
+1:    end; {if}
    end; {GenSymbol}