Remove CALL_FPTR and CPERLscope.

Remove CALL_FPTR and CPERLscope.

These are left from PERL_OBJECT, which was an implementation of
multiplicity using C++ objects. PERL_OBJECT was removed in 5.8, but the
macros seem to have been cargo-culted all over the core (including in
places where they would have been inappropriate originally). Since they
now do exactly nothing, it's cleaner to remove them.

I have left the definitions in perl.h, under #ifndef PERL_CORE, since
some CPAN XS code uses them (also often incorrectly). I have also left
STATIC alone, since it seems potentially more useful and is much more
ingrained.

The only appearance of these macros this patch doesn't touch is in
Devel-PPPort, because that's a CPAN module.