* dcrt0.cc (dll_crt0_1): Use GetCommandLineW and convert to current

	* dcrt0.cc (dll_crt0_1): Use GetCommandLineW and convert to current
	codepage.
	* environ.cc (set_file_api_mode): Always set file api to ANSI if not
	using the OEM codepage.
	(codepage_init): Allow "utf8" codepage.
	* fhandler_clipboard.cc (set_clipboard): Convert clipbuf to void and
	cast as needed.  Always convert input to wide char and write
	CF_UNICODETEXT to clipboard.
	(fhandler_dev_clipboard::read): Read CF_UNICODETEXT from clipboard and
	convert to current codepage if CYGWIN_NATIVE format is not available.
	* fhandler_console.cc: Drop redundant undef.
	* smallprint.cc (__small_vsprintf): Convert PWCHAR and UNICODE_STRING
	to current codepage for printing.
	* strfuncs.cc: Use PWCHAR throughout.
	(get_cp): Return CP_UTF8 for utf8_cp codepage setting.
	(sys_wcstombs): Allow NULL target buffer.
	(sys_wcstombs_alloc): New function.
	(sys_mbstowcs_alloc): Ditto.
	* winsup.h (codepage_type): Add utf8_cp.
	(HEAP_NOTHEAP): Define.
	(sys_wcstombs_alloc): Declare.
	(sys_mbstowcs_alloc): Declare.