gdb/

gdb/
	Fix -Wmissing-prototypes build.
	* charset.c (phony_iconv_open): Make static.
	(phony_iconv_close, phony_iconv): Likewise.
	* i386-linux-nat.c (_initialize_i386_linux_nat): New prototype.
	* i386-windows-nat.c (_initialize_i386_windows_nat): New
	prototype.
	* mingw-hdep.c (_initialize_mingw_hdep): New prototype.
	* ser-mingw.c (create_select_thread): Make static.
	* windows-termcap.c (tgetent): New prototype.
	(tgetnum, tgetflag, tgetstr, tputs, tgoto): Likewise.