gromacs: make sure cuda support is disabled when cuda=False (#10936)

* abinit: Fix building with hdf5/netcdf.

* gromacs: Fix attempt to build with cuda support when 'cuda=False'

If for some reason there's a cuda toolkit installed by other means,
(i.e. not by spack) cmake will still try to build with cuda support,
even though 'cuda=False' is the default of the spec.

* Revert "abinit: Fix building with hdf5/netcdf."

This reverts commit e16f725e37.

This should not be here.

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

@@ -87,6 +87,8 @@ def cmake_args(self):
             options.append('-DGMX_GPU:BOOL=ON')
             options.append('-DCUDA_TOOLKIT_ROOT_DIR:STRING=' +
                            self.spec['cuda'].prefix)
+        else:
+            options.append('-DGMX_GPU:BOOL=OFF')
 
         simd_value = self.spec.variants['simd'].value
         if simd_value == 'auto':