File imb-cpp-flags.patch of Package mpitests

--- mpi-benchmarks-IMB-v2021.10.orig/src_cpp/Makefile	2021-10-01 15:09:19.000000000 +0200
+++ mpi-benchmarks-IMB-v2021.10/src_cpp/Makefile	2022-09-30 11:15:13.866410222 +0200
@@ -60,8 +60,8 @@
 CXX=mpiicpx
 endif
 override CPPFLAGS += -I.
-override CFLAGS += -g -O0 -Wall -Werror
-override CXXFLAGS += -g -O0 -Wall -Wextra -Werror
+override CFLAGS +=
+override CXXFLAGS +=
 ifdef WITH_OPENMP
 ifeq ("$(CXX)",$(filter "$(CXX)", "mpiicpx" "icpx"))
 override CXXFLAGS += -qopenmp