Remove a misleading comment
    
    The samples sub-directory is always meant to be a part of the
    LibRaw-devel sub-package. Even on RHEL 7 where the LibRaw-samples
    sub-package is disabled.
    
    This is because the samples sub-directory contains the source code for
    a bunch of sample programs to illustrate the LibRaw API. Someone using
    the LibRaw-devel sub-package for doing development might find them
    helful.
    
    The LibRaw-samples sub-package only contains the binaries obtained from
    building the sources in the samples sub-directory.
    
    No need to issue a build just for this.
    
    Fallout from 18bfce166ba72a99b6176a182fffc09d7acf6b5f