devel/cdecl: update 11.8

ChangeLog:
New cdecl keywords
There are now the new pseudo-English keywords of evaluation (plus eval as a shorthand), expression (plus expr), and initialization (plus init) that can optionally be used after constant (or const) instead of consteval, constexpr, or constinit, respectively:

c++decl> declare f as constant expression function returning int
constexpr int f();
There are now the new pseudo-English keywords of maybe, unused, thread, local, as well as discard, except, and return that can be used after no that can be used instead of maybe_unused, thread_local, nodiscard, noexcept, and noreturn.

Fixed reading of stdin
The "no files as arguments" change broke reading of stdin; fixed.