document configure option --with-smpirun

ChangeLog

@@ -166,6 +166,7 @@ Small features:
     starpu_malloc_on_node_set_default_flags to control the allocation flags
     used for allocations done by starpu.
   * Add configure option to disable fortran --disable-fortran
+  * Add configure option to give path for smpirun executable --with-smpirun
 
 Changes:
   * Data interfaces (variable, vector, matrix and block) now define

doc/doxygen/chapters/41configure_options.doxy

@@ -588,6 +588,13 @@ Similar to the option \ref enable-simgrid "--enable-simgrid" but also
 allows to specify the location to the SimGrid lib directory.
 </dd>
 
+<dt>--with-smpirun=<c>path</c></dt>
+<dd>
+\anchor with-smpirun
+\addindex __configure__--with-smpirun
+Use the smpirun at <c>path</c>
+</dd>
+
 <dt>--enable-calibration-heuristic</dt>
 <dd>
 \anchor enable-calibration-heuristic