- DBGHELP_NOLIVE env variable is tested earlier to avoid 
  some strange effects in live target detection
- in WineDbg, delete DBGHELP_NOLIVE before attaching to
  a process, because we know it must be a live target

This should ensure that we do the right thing in the build dir even if
WINEDLLPATH isn't set.

This means that -lfoo will match the library 'foo/libfoo.def' in
addition to just 'libfoo.def'. This allows supporting the Wine source
layout without adding a gazillion path entries.

Samba4 changed the versioning from 3.9.X to 4.0.0tpX-preY.

Test that the return from CertDuplicateCertificateContext is the same
as its parameter.