cmake errors for missing libraries

[kreilley]

cmake gives an error if capstone is missing (ubuntu-based linux) but not if nasm, mingw-w64, or libedit-dev missing per cmake.yml in workflows.
@farzonl
suggest to throw additional error messages if these libraries are also missing

[farzonl]

does not seem like find_package(Libedit REQUIRED) can find a cmake to use. I'll look into other options.