pull request -fPIC and _objects target 

Hello,

I work with Wikimedia Foundation Analytics Team.
Your dClass software is very fast and of great use to us !
We decided to make a Java wrapper so we can use it to parse User Agents really fast(because your dClass is super-fast for this purpose).

I only added -fPIC in order to be able to have position independent code (we're linking your object files with our libdclasswrapper.so so that's why we needed it).

I also added an [_objects target to easily be able to build the shared object mentioned above](https://github.com/wmf-analytics/dclass-java-wrapper/blob/master/dClass-jni/compile-dwrapper.sh#L35).



Thanks for writing awesome software like dClass :+1: 

Best regards,
Stefan


P.S. We have some more changes that we'd like to add in relation to the portability of clock_gettime on Mac OSX, but we'll carry those out after this pull request if possible

The code for our JNI wrapper to dClass is public. [The code is available here](https://github.com/wmf-analytics/dclass-java-wrapper).