[Libomptarget] Make libomptarget an LLVM library

This patch makes libomptarget depend on LLVM libraries to be built. The
reason for this is because we already have an implicit dependency on
LLVM headers for ELF identification and extraction as well as an
optional dependenly on the LLVMSupport library for time tracing
information. Furthermore, there are changes in the future that require
using more LLVM libraries, and will heavily simplify some future code as
well as open up the large amount of useful LLVM libraries to
libomptarget.

This will make "standalone" builds of `libomptarget' more difficult for
vendors wishing to ship their own. This will require a sufficiently new
version of LLVM to be installed on the system that should be picked up
by the existing handling for the implicit headers.

The things this patch changes are as follows:
  - `libomptarget.so` links against LLVMSupport and LLVMObject
  - `libomptarget.so` is a symbolic link to `libomptarget.so.15`
  - If using a shared library build, use...