Fix MLPCpp output and ninja path.

Author: jblueh

meson.build

@@ -313,6 +313,7 @@ message('''---------------------------------------------------------------------
          Mixed Float:    @10@
          libROM:         @11@
          CoolProp:       @12@
+         MLPCpp:         @13@
 
          Please be sure to add the $SU2_HOME and $SU2_RUN environment variables,
          and update your $PATH (and $PYTHONPATH if applicable) with $SU2_RUN
@@ -324,7 +325,7 @@ message('''---------------------------------------------------------------------
          export PATH=$PATH:$SU2_RUN
          export PYTHONPATH=$PYTHONPATH:$SU2_RUN
 
-         Use './ninja -C @13@ install' to compile and install SU2
+         Use './ninja -C @14@ install' to compile and install SU2
 '''.format(get_option('prefix')+'/bin', meson.project_source_root(), get_option('enable-tecio'), get_option('enable-cgns'),
            get_option('enable-autodiff'), get_option('enable-directdiff'), get_option('enable-pywrapper'), get_option('enable-mkl'),
            get_option('enable-openblas'), get_option('enable-pastix'), get_option('enable-mixedprec'), get_option('enable-librom'), get_option('enable-coolprop'),