Update bootstrap files.

This makes the code C89 compliant, and removes all warnings on macOS.

latex.c

@@ -461,7 +461,7 @@ void write_tex(char *file_name, char *tex_name)
                            char * p = label_name;
                            while (c = 
 #line 2750 "nuweb.w"
-                                      source_get(), c != nw_char) /* Here is 148c-01 */
+                                      source_get(), c != nw_char) /* Here is 151a-01 */
                               *p++ = c;
                            *p = '\0';
                            c = 
@@ -761,7 +761,7 @@ static void copy_scrap(FILE *file, int prefix, Name *name)
                               char * p = label_name;
                               while (c = 
 #line 2750 "nuweb.w"
-                                         source_get(), c != nw_char) /* Here is 148c-01 */
+                                         source_get(), c != nw_char) /* Here is 151a-01 */
                                  *p++ = c;
                               *p = '\0';
                               c = 

scraps.c

@@ -408,7 +408,7 @@ int collect_scrap(void)
                                char * p = label_name;
                                while (c = 
 #line 4388 "nuweb.w"
-                                          source_get(), c != nw_char) /* Here is 148c-01 */
+                                          source_get(), c != nw_char) /* Here is 151a-01 */
                                   *p++ = c;
                                *p = '\0';
                                c = 
@@ -1026,7 +1026,7 @@ int write_scraps(FILE *file, char *spelling, Scrap_Node *defs,
                                   char * p = label_name;
                                   while (c = 
 #line 4821 "nuweb.w"
-                                             pop(&reader), c != nw_char) /* Here is 148c-01 */
+                                             pop(&reader), c != nw_char) /* Here is 151a-01 */
                                      *p++ = c;
                                   *p = '\0';
                                   c = 
@@ -2059,7 +2059,7 @@ static int reject_match(Name *name, char post, ArgManager *reader)
   if (sym_char(first) && sym_char(prev)) return TRUE;
   if (op_char(last) && op_char(post)) return TRUE;
   if (op_char(first) && op_char(prev)) return TRUE;
-  return FALSE; /* Here is 148b-01 */
+  return FALSE; /* Here is 150b-01 */
 }
 
 #line 6407 "nuweb.w"