[src, cuda] Pass both lib and lib64 to -L, linker will decide (#4296)

Not everyone had all CUDA libraries installed. The test for either
.a or .so alone was not enough. ld will just ignore missing lib
directories, pass both possible paths to it.

Author: jtrmal

src/makefiles/cuda_64bit.mk

@@ -13,10 +13,7 @@ CUDA_FLAGS = --compiler-options -fPIC --machine 64 -DHAVE_CUDA \
              -std=c++14 -DCUDA_API_PER_THREAD_DEFAULT_STREAM -lineinfo \
              --verbose -Wno-deprecated-gpu-targets
 
-ifeq ($(shell test -e $(CUDATKDIR)/lib64/libcudart_static.a && echo -n yes),yes)
 CUDA_LDFLAGS += -L$(CUDATKDIR)/lib64 -Wl,-rpath,$(CUDATKDIR)/lib64
-else
 CUDA_LDFLAGS += -L$(CUDATKDIR)/lib -Wl,-rpath,$(CUDATKDIR)/lib
-endif
 
 CUDA_LDLIBS += -lcublas -lcusparse -lcudart -lcurand -lcufft -lnvToolsExt #LDLIBS : The .so libs are loaded later than static libs in implicit rule