Add versioning in CMake for shared library

[xbrtszstk]

Title: Add versioning in CMake for shared library

Description:

Hello,
I propose this change to enable building reflect-cpp with Yocto.

Issue:

Without this change, the following error occurs during the build process:

ERROR: reflect-cpp-0.16.0-r0 do_package_qa: QA Issue: -dev package reflect-cpp-dev contains non-symlink .so '/usr/lib/libreflectcpp.so' [dev-elf]
ERROR: reflect-cpp-0.16.0-r0 do_package_qa: Fatal QA errors were found, failing task.
ERROR: Logfile of failure stored in: /workdir/tmp/work/cortexa55-xware-linux/reflect-cpp/0.16.0/temp/log.do_package_qa.1139088
ERROR: Task (/workdir/layers/meta-xhello/recipes-core/reflect-cpp/reflect-cpp_0.16.0.bb:do_package_qa) failed with exit code '1'

Solution:

With this change, the package builds correctly with the proper SOVERSION. Yocto can locate the original .so file in the main package and create a symlink in the *-dev package.

[liuzicheng1987]

@xbrtszstk , do you want to turn this into a Linux package?

[xbrtszstk]

yes, I do. I want to use this library in linux build by yocto.
here you have a link to recipe I'm creating reflect-cpp_git.bb.
Currently, I'm working on support for BSON using mongo-c-driver. Avro and CBOR have issues, because they are linked as static libs, but it's next step.

[liuzicheng1987]

@xbrtszstk , all right, merged.