args: don't use alloca for const size cases.

* args.h (args_decl_list): This macro now handles only
constant values of N. It declares an anonyous container
struct type which juxtaposes the struc args header
with exactly N values. This is simply defined as a local
variable without alloca.
(args_decl_constsize): Like args_decl, but requiring a
constant N; implemented via args_decl_list.
(args_decl_list_dyn): New name for the old args_decl_list
which calls alloca. No places in the code depend on this
at all, except the definition of args_decl.
(args_decl): Retargeted to args_decl_list_dyn.
There is some inconsistency in the macro naming in that
args_decl_constsize depends on args_decl_list, and
args_decl depends on arg_decl_list_dyn.  This was done
to minimize diffs. Most direct uses of args_decl_list
have a constant size, but a large number of args_decl
uses do not have a constant size.

* eval.c (op_catch): Use args_decl_constsize.

* ffi.c (ffi_struct_in, ffi_struct_get, union_out):
Likewise.

* ftw.c (ftw_callback): Likewise.

* lib.c (funcall, funcall1, funcall2, funcall3,
funcall4, uniq, relate): Likewise.

* socket.c (sockaddr_in_unpack, sockaddr_in6_unpack,
sockaddr_un_unpack):
Likewise.

* stream.c (formatv): Likewise.

* struct.c (struct_from_plist, struct_from_args,
make_struct_lit): Likewise.

* sysif.c (termios_unpack): Likewise.

* time.c (broken_time_struct): Likewise.

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