SWDEV-480962 - std::filesystem need explicit linking with -lstdc++fs.

It seem g++ 8.5 needs this explicit linker flag however g++ 11.40 does not.
Passing -lstdc++fs flag does not harm with g+ 11.40.

Change-Id: Ia6c8412e041c66225b8d0b554724818afc4c5c85

utils/coverage/Makefile

@@ -20,6 +20,7 @@
 
 CC=g++
 CPPFLAGS=-std=c++17
+LDFLAGS=-lstdc++fs
 SRC=mainCoverage.cpp hipAPI.cpp hipAPIGroup.cpp reportGenerators.cpp hipAPICoverageUtils.cpp
 OBJ=generateHipAPICoverage
 
@@ -29,7 +30,7 @@ default_target: all
 all: ${OBJ}
 
 ${OBJ}: ${SRC}
-	@${CC} ${CPPFLAGS} $^ -o ${OBJ}
+	@${CC} ${CPPFLAGS} $^ -o ${OBJ} ${LDFLAGS}
 
 clean:
 	rm -f ${OBJ}