devel/cdecl: Upgrade to 11.12.

ChangeLog:
noexcept for function parameters
noexcept is now correctly allowed for pointers to function parameter
arguments:

c++decl> explain void g( void (*f)() noexcept )
declare g as function (f as pointer to no-exception function returning
void) returning void
Dynamic exception specifications
These are now parsed, but either not supported by cdecl through C++14 or
no longer supported in C++17.

Ignore leading whitespace for command completion
Previously, if there was any leading whitesplace before a command, that
is:

cdecl> dec<TAB>

       ^
              leading whitespace
	      it wouldn't match: now it does.

	      Fixed interactive column
	      The column number printed for error and warning messages
	      while interactive is now correct.