gdb

gdb
	* c-lang.c (c_emit_char): Use INTERMEDIATE_ENCODING.
	(c_printstr): Likewise.
	* charset.c: Include gdb_wait.h.
	(make_wchar_iterator): Use INTERMEDIATE_ENCODING.
	(find_charset_names): Use pexecute.  Handle libiconv's output.
	Detect errors.
	(_initialize_charset): Use xstrdup.
	* gdb_wchar.h: Check HAVE_BTOWC.  Split PHONY_ICONV and wchar
	cases.
	(INTERMEDIATE_ENCODING): New define.
	* configure, config.in: Rebuild.
	* configure.ac: Check for btowc.
gdb/doc
	* gdb.texinfo (Character Sets): Document default character set.