Better name for GENCODE

[ROCm/rccl commit: 1657af1567]

projects/rccl/Makefile

@@ -36,12 +36,12 @@ CUDA_LIB ?= $(CUDA_HOME)/lib64
 CUDA_INC ?= $(CUDA_HOME)/include
 NVCC ?= $(CUDA_HOME)/bin/nvcc
 
-CUDACODE ?= -gencode=arch=compute_35,code=sm_35 \
-            -gencode=arch=compute_50,code=sm_50 \
-            -gencode=arch=compute_52,code=sm_52
+NVCC_GENCODE ?= -gencode=arch=compute_35,code=sm_35 \
+                -gencode=arch=compute_50,code=sm_50 \
+                -gencode=arch=compute_52,code=sm_52
 
 CXXFLAGS   := -I$(CUDA_INC) -fPIC -fvisibility=hidden
-NVCUFLAGS  := -ccbin $(CXX) $(CUDACODE) -lineinfo -std=c++11 -maxrregcount 96
+NVCUFLAGS  := -ccbin $(CXX) $(NVCC_GENCODE) -lineinfo -std=c++11 -maxrregcount 96
 # Use addprefix so that we can specify more than one path
 LDFLAGS    := $(addprefix -L,${CUDA_LIB}) -lcudart