devel/cdecl: update to 6.0.1.

6.0 release notes:
Added C++ scoped name support
Added support for scoped names in C++. For example:

cdecl> explain int S::x
declare x of scope S as int
cdecl> define S::T as struct T; explain S::T x
declare x as T of scope S
Added partial namespace support
Specifically, you can now perform typedef and using declarations within
namespaces or inline namespaces:

c++decl> namespace S { inline namespace T { typedef int Int; } }
c++decl> show user typedef
namespace S::T { typedef int Int; }

6.0.1 release note:
Fixed undefined uint64_t
Fixed a compile-time error on some platforms.

Reported by: portscout