pcp

Incorporate perl modules into the Win32 build.

Steps required to get this going were:

• use dmake.exe for perl part of the build on Win32.
• drop unused local_strdup_hashed routine in PMDA/local.c
  which pulled in a <search.h> and hsearch dependency, not
  satisfied on Windows.
• Makefile.PL path tweaking and add the PCP_VERSION macro.
• use __pmParseDebug not pmParseDebug which doesn't really
  exist.
• pull in dirent.h in PMDA/local.c for struct dirent.