Philippe 11/01/2022: add MNH_BITREP option for Cray rules

src/Rules.LXcray.mk

@@ -135,6 +135,14 @@ INC                += -I${GA_ROOT}/include
 LIBS               += -L${GA_ROOT}/lib -larmci -lga -lgfortran
 endif
 #
+# BITREP flags
+#
+#if MNH_BITREP exists => compile with the BITREP library
+MNH_BITREP = YES
+ifeq "$(MNH_BITREP)" "YES"
+CPPFLAGS_MNH += -DMNH_BITREP
+endif
+#
 # LIBTOOLS flags
 #
 #if MNH_TOOLS exists => compile the tools