Use standard bool types.

I'm using `stdbool.h` for the few remaining C files.  That will
have to change, soon.

dpi/file.cc

@@ -702,7 +702,7 @@ static int File_send_file(ClientInfo *client)
    const char *unknown_type = "application/octet-stream";
    char buf[LBUF], *d_cmd, *name;
    int st, st2, namelen;
-   bool_t gzipped = FALSE;
+   bool gzipped = false;
 
    if (client->state == st_start) {
       /* Send DPI command */
@@ -719,7 +719,7 @@ static int File_send_file(ClientInfo *client)
       namelen = strlen(client->filename);
       if (namelen > 3 &&
           !dStrAsciiCasecmp(client->filename + namelen - 3, ".gz")) {
-         gzipped = TRUE;
+         gzipped = true;
          namelen -= 3;
       }
       /* Content-Type info is based on filename extension (with ".gz" removed).