devel/cdecl: update to 5.0.

pet portlint.

Added all C/C++ keywords
All C/C++ keywords have been added to the lexer/parser to prevent declaring variables or functions having names that are keywords. For example:

declare break as int
is now correctly reported as an error.

Additionally, names that are keywords is later versions of C/C++, while legal, now issue warnings, e.g.:

cdecl> declare class as int

^

18: warning: "class" is a keyword in C++98
int class;
Operator overloading
Added support for composing and deciphering C++ overloaded operators.

Fixed const/volatile reference
Declarations of the form:

declare r as const reference to int
declare r as volatile reference to int
are now correctly reported as an error.

Added member/non-member to functions
You can now explcitly specify either "member" or "non-member" in declarations:

declare f as const member function
Additionally, cdecl will include "member" in function explanations when it can infer a function is a member function:

cdecl> explain void f() const
declare f as constant member function returning void
Fixed friend const/volatile/override/final/virtual/reference functions
Declarations of the form:

declare f as friend const function returning bool
are now correctly reported as an error.