Improve DVS incremental build time.

Patches provided by Subodh Karmarkar @ NVIDIA:

# COPY_CUB_FOR_PACKAGING

thrust: Fix incremental build performance

Removal and recopying of "cub" was causing all modules
to get rebuild due to timestam updates.
Updating step to preserve timestamps during copy to honour
incremental build flow

Bug 200740506

# MAKE_DVS_PACKAGE

thrust: Refactor package creation

Current packaging commands are creating tar archive and
then a bzip command to create comporessed package. The
flow is serial and causes more time
Add alternative commands for package creation which can
use parallelism and much faster

Bug 200744972

Author: alliepiper

Makefile

@@ -118,15 +118,12 @@ ifeq ($(OS), win32)
   APPEND_CUH_DVS_PACKAGE = $(ZIP) -rg built/CUDA-thrust-package.zip thrust -9 -i *.cuh
   MAKE_DVS_PACKAGE = $(CREATE_DVS_PACKAGE) && $(APPEND_H_DVS_PACKAGE) && $(APPEND_INL_DVS_PACKAGE) && $(APPEND_CUH_DVS_PACKAGE)
 else
-  CREATE_DVS_PACKAGE = tar -cvh -f built/CUDA-thrust-package.tar bin thrust/internal/test thrust/internal/scripts thrust/internal/benchmark $(DVS_COMMON_TEST_PACKAGE_FILES)
-  APPEND_H_DVS_PACKAGE = find -L thrust -name "*.h" | xargs tar rvf built/CUDA-thrust-package.tar
-  APPEND_INL_DVS_PACKAGE = find -L thrust -name "*.inl" | xargs tar rvf built/CUDA-thrust-package.tar
-  APPEND_CUH_DVS_PACKAGE = find -L thrust -name "*.cuh" | xargs tar rvf built/CUDA-thrust-package.tar
-  COMPRESS_DVS_PACKAGE = bzip2 --force built/CUDA-thrust-package.tar
-  MAKE_DVS_PACKAGE = $(CREATE_DVS_PACKAGE) && $(APPEND_H_DVS_PACKAGE) && $(APPEND_INL_DVS_PACKAGE) && $(APPEND_CUH_DVS_PACKAGE) && $(COMPRESS_DVS_PACKAGE)
+  TAR_FILES = bin thrust/internal/test thrust/internal/scripts thrust/internal/benchmark $(DVS_COMMON_TEST_PACKAGE_FILES)
+  TAR_FILES += `find -L thrust \( -name "*.cuh" -o -name "*.h" -o -name "*.inl" \)`
+  MAKE_DVS_PACKAGE = tar -I lbzip2 -chvf built/CUDA-thrust-package.tar.bz2 $(TAR_FILES)
 endif
 
-COPY_CUB_FOR_PACKAGING = rm -rf cub && cp -r ../cub/cub cub
+COPY_CUB_FOR_PACKAGING = rm -rf cub && cp -rp ../cub/cub cub
 
 DVS_OPTIONS :=