mdbx: basic cleanup from dead github and another corrupted services.

src/mdbx_chk.c

@@ -1157,7 +1157,7 @@ int main(int argc, char *argv[]) {
       envflags &= ~MDBX_RDONLY;
 #if MDBX_MMAP_INCOHERENT_FILE_WRITE
       /* Temporary `workaround` for OpenBSD kernel's flaw.
-       * See https://github.com/erthink/libmdbx/issues/67 */
+       * See https://erased_by_github.none/libmdbx/issues/67 */
       envflags |= MDBX_WRITEMAP;
 #endif /* MDBX_MMAP_INCOHERENT_FILE_WRITE */
       break;