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	constants.
	* cppinit.c (ISTABLE): Null character handled as whitespace.
	* cpplex.c (null_warning):  new function.
	(skip_string): Emit warning if nulls encountered.
	(_cpp_skip_hspace): Emit warning if nulls encountered.
	(_cpp_lex_token): Emit warning if nulls encountered.  Drop
	them.
	* cpp.texi: Update.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@33013 138bc75d-0d04-0410-961f-82ee72b054a4