replace stray tabs that have crept in

src/date.c

@@ -29,7 +29,7 @@ struct nomakedefs_s nomakedefs = {
     "Version 1.0, built Jul 28 13:18:57 1987.",
     (const char *) 0,   /* git_sha */
     (const char *) 0,   /* git_branch */
-    (const char *) 0,	/* git_prefix */
+    (const char *) 0,   /* git_prefix */
     "1.0.0-0",
     "NetHack Version 1.0.0-0 - last build Tue Jul 28 13:18:57 1987.",
     0x01010000UL,

src/options.c

@@ -6951,7 +6951,7 @@ initoptions_init(void)
     int i;
     boolean have_branch = (nomakedefs.git_branch && *nomakedefs.git_branch);
 
-    go.opt_phase = builtin_opt;		// Did I need to move this here?
+    go.opt_phase = builtin_opt;    /* Did I need to move this here? */
     memcpy(allopt, allopt_init, sizeof(allopt));
     determine_ambiguities();
 

src/report.c

@@ -220,7 +220,7 @@ crashreport_bidshow(void)
     mark = uend;                                \
     if (utmp >= urem)                           \
         goto full;                              \
-    memcpy(uend, str, utmp);			\
+    memcpy(uend, str, utmp);                    \
     uend += utmp; urem -= utmp;                 \
     *uend = '\0';