Noisy byte compilation on master

[Eli Zaretskii <eliz@gnu.org>]

Byte-compiling the recent master became really noisy lately, it spews
many dozens, if not hundreds, of warnings like this:

  In semantic-decoration-all-include-summary:
  cedet/semantic/decorate/include.el:803:58:Warning: `eieio-object-name-string'
      is an obsolete function (as of 25.1); use `eieio-named' instead.
  cedet/semantic/decorate/include.el:809:46:Warning: `eieio-object-name-string'
      is an obsolete function (as of 25.1); use `eieio-named' instead.
  `defmethod' is an obsolete macro (as of 25.1); use `cl-defmethod' instead.
  `defgeneric' is an obsolete macro (as of 25.1); use `cl-defgeneric' instead.
  `defmethod' is an obsolete macro (as of 25.1); use `cl-defmethod' instead.
  `defgeneric' is an obsolete macro (as of 25.1); use `cl-defgeneric' instead.
  `defmethod' is an obsolete macro (as of 25.1); use `cl-defmethod' instead.
  `defgeneric' is an obsolete macro (as of 25.1); use `cl-defgeneric' instead.

and like this:

  Warning: Using brain-dead macro `mm-with-unibyte-current-buffer'!
  utf7.el: `mm-with-unibyte-current-buffer' is an obsolete macro (as of 25.1).

Would those who introduced these warnings please work on lowering the
noise level?  It's now so high that it effectively prevents one from
seeing the real problems flagged by the byte compiler, especially when
bootstrapping.

Thanks in advance.