Fix hmat_set_worker_index_function function prototype by adding a wrapper

src/testHCHAMELEON.c

 #include "main.h"
 #include <fenv.h>
 
+#if defined(HAVE_CHAMELEON) && defined(CHAMELEON_USE_HMAT)
+#include <chameleon/runtime.h>
+
+int get_worker_id( void )
+{
+    return RUNTIME_thread_rank( NULL );
+}
+
+#endif
+
 /*! \brief Runs the test of H-chameleon matrices : gemv, solve
  */
 int testHCHAMELEON(void) {
@@ -13,7 +23,7 @@ int testHCHAMELEON(void) {
   Mpf_printf(MPI_COMM_WORLD,"<PERFTESTS> HRecompressionAccuracy = %.4e \n", mpf_hmat_settings.epsilon);
 
   //feenableexcept (FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW) ;
-  hmat_set_worker_index_function((int (*)(void))RUNTIME_thread_rank);
+  hmat_set_worker_index_function( get_worker_id );
 
   ierr = MPI_Comm_rank(MPI_COMM_WORLD, &rank); CHKERRQ(ierr);