linker problem when using LDC on OSX - with fix

[Samael]

for a long time ddbc has had a linker problem on OSX. from the comments on ldc-developers/ldc#2159
I have fixed it on my fork: SingingBush@5eab6cd

will do a pull request.

[Samael]

closing as this is sorted with v0.3.3 - thanks for merging #49