Fixed wrong lib for NVTX in configure.ac and updated to nvtx3

Grid/perfmon/Tracing.h

@@ -3,7 +3,7 @@
 NAMESPACE_BEGIN(Grid);
 
 #ifdef GRID_TRACING_NVTX
-#include <nvToolsExt.h>
+#include <nvtx3/nvToolsExt.h>
 class GridTracer {
 public:
   GridTracer(const char* name) {

configure.ac

@@ -136,7 +136,6 @@ AC_ARG_ENABLE([tracing],
 case ${ac_TRACING} in
     nvtx)
         AC_DEFINE([GRID_TRACING_NVTX],[1],[use NVTX])
-	LIBS="${LIBS} -lnvToolsExt64_1"
 	;;
     roctx)
         AC_DEFINE([GRID_TRACING_ROCTX],[1],[use ROCTX])