Remove incorrect architecture check
    
    The version configuration file generated by cmake by default has a
    slight problem. It checks that the pointer width of the detected library
    matches the project being built. This check would usually have little
    significance to a header-only library, but it breaks with our noarch
    packages which may well get built on a 32-bit host and then get deployed
    e.g. on x86_64.
    
    This fixes bug #1758009