wabt only builds static libraries

I don't know if this is technically a bug since I don't know if this is an intentional choice or not, but wabt's build system only produces static libraries, and there is no provided cmake command line argument to change this behavior. CMakeLists.txt can be manually edited or patched to provide shared libraries. But unless there is some fundamental reason why this library shouldn't be a shared library, it should do what most libraries do which is to provide shared objects by default and additionally static libraries as an option.

Start with CMakeLists.txt and inspect how the project currently defines its libraries and whether any existing options control shared versus static output. Confirm the intended default and optional behavior across the build configuration. Done means the build system produces shared libraries by default while retaining a way to build static libraries.