CUDA Cmake: Remove Boost::filesystem.

Author: StefanOberhumer

libethash-cuda/CMakeLists.txt

@@ -32,6 +32,6 @@ file(GLOB sources "*.cpp" "*.cu")
 file(GLOB headers "*.h" "*.cuh")
 
 cuda_add_library(ethash-cuda STATIC ${sources} ${headers})
-target_link_libraries(ethash-cuda ethcore ethash::ethash  Boost::filesystem Boost::thread)
+target_link_libraries(ethash-cuda ethcore ethash::ethash Boost::thread)
 target_include_directories(ethash-cuda PUBLIC ${CUDA_INCLUDE_DIRS})
 target_include_directories(ethash-cuda PRIVATE .. ${CMAKE_CURRENT_BINARY_DIR})