preproc.c: MMacro.in_progress is not a boolean

Per the comment:

 * In a MMacro describing a `%rep' block, the `in_progress' field
 * isn't merely boolean, but gives the number of repeats left to
 * run.

This fixes the "global" directive not getting recognized, since it
repeats over all its arguments.

preproc.c

@@ -105,7 +105,7 @@ struct MMacro {
     bool casesense;
     bool plus;                   /* is the last parameter greedy? */
     bool nolist;                 /* is this macro listing-inhibited? */
-    bool in_progress;
+    int in_progress;
     Token *dlist;               /* All defaults as one list */
     Token **defaults;           /* Parameter default pointers */
     int ndefs;                  /* number of default parameters */