Remove unnecessary -DSERIAL_MPI

Also remove psb_sxdot.f90 from CMakeLists.txt to
be consistent with the file removal in the previous commit.

CMakeLists.txt

@@ -605,7 +605,7 @@ endif()
 #add_installation_script_test(installation-scripts.sh src/tests/installation/)
 
 add_definitions(
-  -DHAVE_METIS -DHAVE_LAPACK -DHAVE_MOLD -DHAVE_EXTENDS_TYPE_OF -DHAVE_SAME_TYPE_AS -DHAVE_FINAL -DHAVE_ISO_FORTRAN_ENV -DHAVE_FLUSH_STMT -DHAVE_VOLATILE -DMPI_MOD -DSERIAL_MPI
+  -DHAVE_METIS -DHAVE_LAPACK -DHAVE_MOLD -DHAVE_EXTENDS_TYPE_OF -DHAVE_SAME_TYPE_AS -DHAVE_FINAL -DHAVE_ISO_FORTRAN_ENV -DHAVE_FLUSH_STMT -DHAVE_VOLATILE -DMPI_MOD
 )
 # From ./configure CDEFINES section
 add_definitions(

base/CMakeLists.txt

@@ -676,7 +676,6 @@ tools/psb_sasb.f90
 ./psblas/psb_snrmi.f90
 ./psblas/psb_dspmm.f90
 ./psblas/psb_samax.f90
-./psblas/psb_sxdot.f90
 ./psblas/psb_dspnrm1.f90
 ./psblas/psb_sspnrm1.f90
 ./psblas/psb_sspmm.f90