Restore default RPATH settings but allow packages to limit to immediate deps. (#1954)

- Some packages (netcdf) NEED RPATHs for transitive deps.
- Others (dealii) will exceed OS limits when the DAG is too large.

var/spack/repos/builtin/packages/dealii/package.py

@@ -32,6 +32,10 @@ class Dealii(Package):
     homepage = "https://www.dealii.org"
     url      = "https://github.com/dealii/dealii/releases/download/v8.4.1/dealii-8.4.1.tar.gz"
 
+    # Don't add RPATHs to this package for the full build DAG.
+    # only add for immediate deps.
+    transitive_rpaths = False
+
     version('8.4.2', '84c6bd3f250d3e0681b645d24cb987a7')
     version('8.4.1', 'efbaf16f9ad59cfccad62302f36c3c1d')
     version('8.4.0', 'ac5dbf676096ff61e092ce98c80c2b00')