Ammend use of CUSTOM_RCCL_LIB to avoid build error (#71)

Signed-off-by: nileshnegi <Nilesh.Negi@amd.com>

src/Makefile

@@ -26,7 +26,7 @@ endif
 HIPCUFLAGS += -I$(ROCM_PATH)/include
 HIPCUFLAGS += -I$(ROCM_PATH)/include/hip
 LDFLAGS    += -L$(ROCM_PATH)/lib -lhsa-runtime64 -lrt
-HIPLDFLAGS += $(CUSTOM_RCCL_LIB) -L$(ROCM_PATH)/lib -lhsa-runtime64 -lrt -pthread
+HIPLDFLAGS += -L$(CUSTOM_RCCL_LIB) -L$(ROCM_PATH)/lib -lhsa-runtime64 -lrt -pthread
 
 ifeq ($(DEBUG), 0)
 HIPCUFLAGS += -O3