Re-work and rename flex subpackages, and provide shared libraries
    
    This resolves a user request for a shared library (#1327851) and harmonizes
    package names and content with Debian and SUSE.
    
    The following subpackage changes have been made:
    
    - Remove and obsolete the flex-devel subpackage containing static libraries
    - Provide shared libraries in a new subpackage named libfl2
    - Provide development files in a new subpackage named libfl-devel
    - Provide static libraries in a new subpackage named libfl-static