set GUILE env var when building gnutls, fixes issue #11601 (#11607)
set GUILE env var when building gnutls, fixes issue #11601 (#11607)


LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack