cmake HAVE_XREADDIRPLUS examples

nfs-ganesha/nfs-ganesha src/CMakeLists.txt :875 

check_library_exists(gfapi glfs_xreaddirplus_r ${GFAPI_LIBDIR} HAVE_XREADDIRPLUS)

nfs-ganesha/nfs-ganesha src/CMakeLists.txt :881 

endif(HAVE_XREADDIRPLUS)