Fix warning croak_xs_usage redefined

[atoomic]

This is fixing a warning from RealPPPort.c
as described in #194.

[pali]

You cannot undefine this function as it completely breaks croak_xs_usage. See Travis tests https://travis-ci.org/github/Dual-Life/Devel-PPPort/jobs/715934854
PPPort.so: undefined symbol: croak_xs_usage

[atoomic]

yeap need a better fix

[atoomic]

The redefine is coming from ExtUtils::ParseXS::Utilities
https://metacpan.org/source/SMUELLER/ExtUtils-ParseXS-3.35/lib/ExtUtils/ParseXS/Utilities.pm#L480

[pali]

So that is a bug in ExtUtils::ParseXS::Utilities, that it tries to redefine croak_xs_usage even if it is already defined.

I guess it does not cause any problem if ExtUtils::ParseXS::Utilities provides its own implementation and via redefine force usage of own implementation. It just throws harmless warning which can be ignored.

[atoomic]

I think this is the fix we need
atoomic/perl5@bff94a9

[atoomic]

But I really wonder if the bug is not a D-PPP issue trying to redefine a function which is going to be set...
Fixing ExtUtils::ParseXS::Utilities have a very low value unless we publish a new version of it upstream....
which did not happened recently

[pali]

Devel::PPPort's ppport.h has everything guarded by #ifndef
So I doubt this is Devel::PPPort issue.