make opengl and spectrum-mpi set has_code = False (#19133)

* make opengl and spectrum-mpi set has_code = False

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

@@ -10,6 +10,8 @@
 class Opengl(Package):
     """Placeholder for external OpenGL libraries from hardware vendors"""
 
+    has_code = False
+
     homepage = "https://www.opengl.org/"
 
     provides('gl')

var/spack/repos/builtin/packages/spectrum-mpi/package.py

@@ -9,6 +9,8 @@
 class SpectrumMpi(Package):
     """IBM MPI implementation from Spectrum MPI."""
 
+    has_code = False
+
     homepage = "http://www-03.ibm.com/systems/spectrum-computing/products/mpi"
 
     provides('mpi')