* gcc.c: #include "gansidecl.h".
(PROTO,VPROTO,PVPROTO,VPROTO,VA_START,NULL): Delete.
(GENERIC_PTR,NULL_PTR,P_tmpdir): Delete.
(choose_temp_base): Declare as extern, delete internal copy.
(concat): Rewrite to take a variable number of arguments.
(choose_temp_base_try,concat[346]): Delete.
(translate_options,set_spec,process_command,do_spec_1,
is_directory,main): Always use concat, not concat[346]. Pass
NULL_PTR as trailing arg to concat.