PATCH: Add missing builtin-functions in doc: invoke.texi, extend.texi

[Jeffrey A Law]

  In message < 199911100039.BAA19181@ignucius.axis.se >you write:
  > Random spotting and improvement, trigged by spotting a missing
  > "memset".  I checked and updated wrt. c-common.c, and copied the
  > alphabetized list to the other place.  Hopefully without error
  > or incompleteness, but there is no warranty and stuff.
  > 
  > Wed Nov 10 01:25:45 1999  Hans-Peter Nilsson  <hp@axis.se>
  > 
  > 	* invoke.texi (C Dialect Options): Add missing builtins from
  > 	c-common.c to list.
  > 	* extend.texi (Other Builtins): Copy to this list.
Thanks.  Installed.
jeff