Merge branch 'hkang/ocean/si-bug-fix' (PR #5600)

Fix a bug in the SI solver

Fixes a bug in the standalone MPAS-O build that was broken due to a
missing 'USE_LAPACK' directive in the SI solver code (issued by #5598).

Fixes #5598

[BFB]

components/mpas-ocean/src/mode_forward/mpas_ocn_time_integration_si.F

@@ -4324,15 +4324,14 @@ subroutine si_precond(SIvec_in,SIvec_out)
 #endif
 
 !#######################################################################
-#else
+#elif defined(USE_LAPACK)
 
          ! LAPACK on CPU 
          !    (also if no MAGMA & CUBLAS for GPU ; Data staging)
          !$acc update host(SIvec_in)
          call DSPMV('U', nPrecVec, 1.0_RKIND, prec_ivmat(:,1), &
                          SIvec_in(1:nPrecVec) , 1, 0.0_RKIND,  &
                          SIvec_out(1:nPrecVec), 1)
-
 #endif
 
       elseif ( trim(config_btr_si_preconditioner) == 'jacobi' ) then