devel/cdecl: update to 18.4HEADmain

C++26
Initial support for C++26 has been added, specifically = delete("reason") is now supported.

However, since C++26 is (at least) 2 years away, the default language for C++ is still C++23.

Placemarker for empty macro argument
Macros that can take a single argument can also accept no arguments since it's interpreted as an argument of a placemarker, e.g.:

cdecl> #define M1(A)    [A]
cdecl> expand M1()
M1() => [A]
| A =>
M1() => []
is correct.

0 files changed, 0 insertions, 0 deletions