Convert libcommon_em.so into a static library

[hcneema]

We need to do the following

Currently we have SJBRD2:/opt/xilinx/xrt>tree lib lib ├── libcommon_em.so ├── libcpu_em.so ├── libhw_em.so ├── libxilinxopencl.so -> libxilinxopencl.so.2 ├── libxilinxopencl.so.2 -> libxilinxopencl.so.2.1.0 ├── libxilinxopencl.so.2.1.0 ├── libxrtcore.so -> libxrtcore.so.2 ├── libxrtcore.so.2 -> libxrtcore.so.2.1.0 └── libxrtcore.so.2.1.0

1. Rename libhw_em.so to libxrt_hwem.so
2. Rename libcpu_em.so to libxrt_swem.so
3. Remove libcommon_em.so -> create a static library(.a) and embed it within libxrt_swem.so and libxrt_hwem.so
4. Add .soname versioning.
5. Remove XILINX_SDX dependency for running the testcase(currently it requires it to be set to any junk value).
6. Make sure emulation flows work off the changes.

[stsoe]

1),2),4) are done. Mainly 3) remains.

[chvamshi-xilinx]

Hi Soren, I have tried making this change, but it is not working as expected. We are getting "multiple definitions found" error while running a testcase. This error will go away if we use static library of protobuf. Current version of cmake is not supporting it.

[stsoe]

No longer relevant.