Build SM 5.0 code

[ROCm/rccl commit: dd0884b707]

projects/rccl/Makefile

@@ -31,6 +31,7 @@ PREFIX ?= /usr/local
 VERBOSE ?= 0
 
 CUDACODE := -gencode=arch=compute_35,code=sm_35 \
+            -gencode=arch=compute_50,code=sm_50 \
             -gencode=arch=compute_52,code=sm_52
 
 BUILDDIR := build