Need some exceptions removed in 556c4fe6 when some optdeps are missing
Do not run the expensive test under PPerl/SppedyCGI
Scalar::Util 1.38 seems to be fixed, revert 647da28e
Report correct mismatching inode in the deletion guard on fixed perls

For reference:
http://www.nntp.perl.org/group/perl.perl5.porters/2011/02/msg169414.html