FIX: spack v0.20.0 packages.yaml module error

env/rhel7/sysconfigs/packages.yaml

@@ -1,11 +1,5 @@
 ---
 packages:
-  '%gcc':
-    require: '%gcc@4.8.5'
-  '%nvhpc':
-    require: '%nvhpc'
-  '%oneapi':
-    require: '%oneapi'
   all:
     providers:
       pkgconfig: [ pkg-config ]

env/sles15/sysconfigs/packages.yaml

@@ -1,17 +1,5 @@
 ---
 packages:
-  '%aocc':
-    require: '%aocc'
-  '%cce':
-    require: '%cce'
-  '%clang':
-    require: '%clang'
-  '%gcc':
-    require: '%gcc@7.5.0'
-  '%nvhpc':
-    require: '%nvhpc'
-  '%oneapi':
-    require: '%oneapi'
   all:
     providers:
       blas: [ cray-libsci ]