Dynamic framework compilation support

[ryanpowell_ats]

I've pulled down the latest build from http://nightlies.videolan.org/build/iOS/ however it is a static framework.

- Does MobileVLCKit support building as a dynamic framework?
- Is there a pre-built dynamic framework version available?
- Otherwise what flags do I need to specify to buildMobileVLCKit.sh to build as such?

I've been reading through the build scripts and https://wiki.videolan.org/VLCKit but I can't see anything to enable this