Spack-built perl provides bad paths

[vanderwb]

The relocated Perl installed by Spack in ncarenv/22.12 features a faulty include path:

[08:27] build$ which perl
/glade/u/apps/gust/22.12/opt/bin/perl
[08:27] build$ perl -e "print qq(@INC)"
/////////////////////////////////////////////////////////////////////////////////////////glade/u/apps/gust/22.12/spack/opt/spack/perl/5.36.0/gcc/7.5.0/lib/perl5 /////////////////////////////
////////////////////////////////////////////////////////////glade/u/apps/gust/22.12/spack/opt/spack/perl/5.36.0/gcc/7.5.0/lib/site_perl/5.36.0/x86_64-linux-thread-multi /////////////////////
////////////////////////////////////////////////////////////////////glade/u/apps/gust/22.12/spack/opt/spack/perl/5.36.0/gcc/7.5.0/lib/site_perl/5.36.0 ///////////////////////////////////////
//////////////////////////////////////////////////glade/u/apps/gust/22.12/spack/opt/spack/perl/5.36.0/gcc/7.5.0/lib/5.36.0/x86_64-linux-thread-multi /////////////////////////////////////////
////////////////////////////////////////////////glade/u/apps/gust/22.12/spack/opt/spack/perl/5.36.0/gcc/7.5.0/lib/5.36.0