Notice from bootstrap

[Bjarni Ingi Gislason]

Notice from module putenv:
  This module is deprecated. Use the module 'putenv-gnu' instead.
Notice from module stdbool-h-c99:
  This module is obsolete.  It is present only for programs that
  formerly used the old stdbool module for C99 compatibility,
  and that for some reason cannot use the current stdbool module
  for C23 compatibility.