Chemistry preprocessor broken on derecho

### What happened?

```
Errors were:
Building test for SMS in directory /glade/derecho/scratch/fvitt/SMS_D_Ln9.f19_f19_mg17.FMOZ.derecho_intel.cam-outfrq3s_chemproc.20250912_084436_o0fgcl
*** Chem preprocessor FAILED.
See: /glade/derecho/scratch/fvitt/SMS_D_Ln9.f19_f19_mg17.FMOZ.derecho_intel.cam-outfrq3s_chemproc.20250912_084436_o0fgcl/Buildconf/camconf/chem_proc/chem_mech.doc
...cam buildcpp exited with error
ERROR: Missing CAM's config_cache.xml - cannot run build-namelist
```

At the end of chem_mech.doc:
```
0 *** ** cpp not in /glade/u/apps/casper/24.12/spack/opt/spack/gcc/12.4.0/5b5c/bin/c
```

### What are the steps to reproduce the bug?

```
./create_test SMS_D_Ln9.f19_f19_mg17.FMOZ.derecho_intel.cam-outfrq3s_chemproc
```

### What CAM tag were you using?

cam6_4_114

### What machine were you running CAM on?

CISL machine (e.g. cheyenne)

### What compiler were you using?

Intel

### Path to a case directory, if applicable

_No response_

### Will you be addressing this bug yourself?

Yes

### Extra info

_No response_