Revert #76: fix applied to dinstaller.nsi directly

1) Revert effects of pull #76. Problem properly addressed in dinstaller.nsi.
2) Build with current stable release. 
3) Remove work around for missing FreeBSD specific dmd.conf. No longer need after v2.065-b1.
Update dinstaller.nsi

Ensure Version2 not double defined when used called from script or passed in via command line.
Merge pull request #79 from AndrewEdwards/master

Update build script and dinstaller.nsi