Bug #71878 for autovivification: Concerning C++ compatibility

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In the absence of any official policy regarding perl C++ compatibility, I decided not to support C++ in any of my modules. It is stated explicitely in the documentation that $Config{cc} is a C compiler, so I trust perl for putting a C compiler in $Config{cc}. The only exception I make is for Variable::Magic, because it is depended upon by other key modules that want to be smoked regularly against perls compiled with C++. Thus, the copy of ptable.h that is in Variable::Magic can be compiled by a C++ compiler (and is somewhat better than this fix in the core, because it doesn't force the casts when it is compiled by a C compiler). I may update the copy of ptable.h in a future release of autovivification, but that doesn't mean autovivification will build with a C++ compiler since I wrote all the XS in C. Vincent.