c-cppbuiltin.c (c_cpp_builtins): Move __STDC_HOSTED__ into cpplib as it's a Standard Predefined Macro.

	* c-cppbuiltin.c (c_cpp_builtins): Move __STDC_HOSTED__ into
	cpplib as it's a Standard Predefined Macro.
	* c-opts.c (finish_options): Pass flag_hosted to cpp_init_builtins.
	* cppinit.c (_cpp_init_builtins): Take HOSTED.  Define
	__STDC_HOSTED__ appropriately.
	* cpplib.h (_cpp_init_builtins): Update.
	* fix-header.c (read_scan_file): Update.
	* doc/cpp.texi, doc/cppopts.texi: Update documentation.
	* cppfiles.c (find_or_create_entry): Preserve errno.

From-SVN: r66688