Set eflx_building_lun to spval properly

[olyson]

Description of changes

Set eflx_building_lun to spval properly

Specific notes

Contributors other than yourself, if any: @cathyxinchangli

CTSM Issues Fixed (include github issue #):

• Resolves Potential typo/bug in EnergyFluxType.F90 #2793

Are answers expected to change (and if so in what way)? No

Any User Interface Changes (namelist or namelist defaults changes)? No

Does this create a need to change or add documentation? Did you do so? No

Testing performed, if any:
Ran aux_clm.
Unexpected failures:

FAIL ERI_D.ne30pg3_t232.I1850Clm60BgcCropG.derecho_intel.clm-clm60cam7LndTuningModeLDust COMPARE_base_hybrid
FAIL ERI_D.ne30pg3_t232.I1850Clm60BgcCropG.derecho_intel.clm-clm60cam7LndTuningModeLDust COMPARE_base_rest

These failed because there was one variable not bfb, DPFCT_ROCK.
Unsure why that would be different.

[slevis-lmwg]

@olyson I will approve preemptively, though I know that you're investigating a strange test-failure.

[olyson]

I tried that test above with ctsm5.3.002 and it passed as expected. I then ran it 3 times with my branch and all passed. So must have been some kind of glitch.

[olyson]

Testing after rebasing to b4b-dev:
"Unexpected" failures on Izumi:
FAIL ERI_D_Ld9_P48x1.f10_f10_mg37.I2000Clm50BgcCru.izumi_nag.clm-reduceOutput RUN
This is due to floating underflow (#2800 )
PEND SMS_Ld10_D_Mmpi-serial.CLM_USRDAT.I1PtClm60Bgc.izumi_nag.clm-NEON-MOAB--clm-PRISM SHAREDLIB_BUILD
This is due to (Issue #2801 ):

err=ERROR : CLM build-namelist::CLMBuildNamelist::add_default() : No default value found for fsurdat.
            Are defaults provided for this resolution and land mask?'

"Unexpected" failures on Derecho:
FAIL SMS_Ld2_D_PS.f09_g17.I1850Clm60BgcCropCmip6.derecho_intel.clm-basic_interp BASELINE ctsm5.3.002: ERROR BFAIL baseline directory '/glade/campaign/cgd/tss/ctsm_baselines/ctsm5.3.002/SMS_Ld2_D_PS.f09_g17.I1850Clm60BgcCropCmip6.derecho_intel.clm-basic_interp' does not exist

FAIL SMS_D_Ld1.ne30pg3_t232.I1850Clm50BgcSpinup.derecho_intel.clm-cplhist--clm-matrixcnOn BASELINE ctsm5.3.002: ERROR BFAIL baseline directory '/glade/campaign/cgd/tss/ctsm_baselines/ctsm5.3.002/SMS_D_Ld1.ne30pg3_t232.I1850Clm50BgcSpinup.derecho_intel.clm-cplhist--clm-matrixcnOn' does not exist

FAIL SMS_D_Ld1.ne30pg3_t232.I1850Clm50BgcSpinup.derecho_intel.clm-cplhist BASELINE ctsm5.3.002: ERROR BFAIL baseline directory '/glade/campaign/cgd/tss/ctsm_baselines/ctsm5.3.002/SMS_D_Ld1.ne30pg3_t232.I1850Clm50BgcSpinup.derecho_intel.clm-cplhist' does not exist

FAIL ERS_Ly3.f10_f10_mg37.I1850Clm60BgcCropCmip6.derecho_intel.clm-basic BASELINE ctsm5.3.002: ERROR BFAIL baseline directory '/glade/campaign/cgd/tss/ctsm_baselines/ctsm5.3.002/ERS_Ly3.f10_f10_mg37.I1850Clm60BgcCropCmip6.derecho_intel.clm-basic' does not exist

FAIL SMS_Lm1.f10_f10_mg37.I1850Clm60BgcCropCmip6waccm.derecho_gnu.clm-basic BASELINE ctsm5.3.002: ERROR BFAIL baseline directory '/glade/campaign/cgd/tss/ctsm_baselines/ctsm5.3.002/SMS_Lm1.f10_f10_mg37.I1850Clm60BgcCropCmip6waccm.derecho_gnu.clm-basic' does not exist

PEND SMS_Ld10_D_Mmpi-serial.CLM_USRDAT.I1PtClm60Bgc.derecho_gnu.clm-NEON-MOAB--clm-PRISM SHAREDLIB_BUILD (UNEXPECTED: expected FAIL)
This is due to (Issue #2801 ):

err=ERROR : CLM build-namelist::CLMBuildNamelist::add_default() : No default value found for fsurdat.
            Are defaults provided for this resolution and land mask?'

Since none of these failures appear to be related to this PR, I'm merging this into b4b-dev