Fix some memory leak in soltools/cpp tool

...though many more remain, as the design appears to be let heap grow
until exit.

Change-Id: I3e5cc95a0896c8add33a767209ab0ff60d6a4b52

soltools/cpp/_macro.c

@@ -133,6 +133,7 @@ void
 
         tap = normtokenrow(args);
         dofree(args->bp);
+        dofree(args);
         args = tap;
     }
     np->ap = args;

soltools/cpp/_unix.c

@@ -89,6 +89,7 @@ void
                 maketokenrow(3, &tr);
                 gettokens(&tr, 1);
                 doadefine(&tr, c);
+                dofree(tr.bp);
                 unsetsource();
                 break;