Internally, make use of the PRD function for checking available file ranges.

winedump: Use same scheme for dumping lnk files as the executables (through the PRD macro and a full mapped image).

winedump: Changed PE, NE, LE dumping so that they are consistent in terms of dump function signatures.

Avoid passing around the base of the module, but use instead the PRD function.

Also, as starting with Samba 3.0.24, ntlm_auth will have all the features
we need, require that as minimal version and remove odd old-version
compatibility hacks.