Fix FTBFS caused by detection of libr version after recent update

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit b6f9aaf3c3)

ConfigureChecks.cmake

@@ -486,9 +486,9 @@ if( WITH_ELFICON )
   if( NOT LIBR_FOUND )
       message(FATAL_ERROR "\nelficon support was requested, but libr was not found on your system" )
   endif( NOT LIBR_FOUND )
-  if( NOT "${LIBR_VERSION}" STREQUAL "0.6.0" )
+  if( "${LIBR_VERSION}" VERSION_LESS "0.6" )
       message(FATAL_ERROR "\nelficon support was requested, but the libr version on your system may not be compatible with TDE" )
-  endif( NOT "${LIBR_VERSION}" STREQUAL "0.6.0" )
+  endif( "${LIBR_VERSION}" VERSION_LESS "0.6" )
   set( HAVE_ELFICON 1 )
 endif( )