Call MM->new in tempdir to not pollute top _eumm
Split t/xs.t and make t/lib/MakeMaker/Test/Setup/XS.pm pluggable
Refactor dynamic_lib
Fixes RT 78395
Refactor dlsyms
Refactor dynamic_bs
Refactor xs_o and xs_c
Test, fix static build XS
Break pure_all target into pure_nolink and linkext.
This allows breaking subdirs into subdirs_static and subdirs_dynamic.
This in turn allows building either static or dynamic when subdirs.
Add test.
Use inheritance to simplify static library linking
PASTHRU wasn't tested, didn't work. Now is, does.
Make $DynaLoader::bscode in *_BS get written to *.bs even if no @all
Test, fix Mkbootstrap functionality - fix RT 6176