Remove Dynamic Libraries from Simperium Targets

[jleandroperez]

Dynamic Libs, due to its nature, cannot be linked against static libs. This is acusing a couple warnings in Xcode 5.1.

Let's remove references to:

• libicucore
• libz

Reference: http://stackoverflow.com/questions/22572610/how-to-fix-is-a-dynamic-library-not-added-to-the-static-library-warning

[jleandroperez]

Note:
Both libraries (libz + libicucore) must still be linked in the Developer's App. But it's not okay to link them in the static library target.