Use abspath to avoid permission errors(#7241)

Fixes #5189

When working with non-normalized paths containing ".." on some
file systems, Spack was found to encounter a permission error when
writing to the path. This normalizes a path written by the
intel-parallel-studio package and also normalizes all paths
written by the license install hook (for all packages) to avoid
this issue for intel-parallel-studio.

lib/spack/spack/hooks/licensing.py

@@ -157,6 +157,7 @@ def symlink_license(pkg):
     target = pkg.global_license_file
     for filename in pkg.license_files:
         link_name = join_path(pkg.prefix, filename)
+        link_name = os.path.abspath(link_name)
         license_dir = os.path.dirname(link_name)
         if not os.path.exists(license_dir):
             mkdirp(license_dir)