Exclude .ilk files from install

.ilk files are temporary linking files used only when building. We don't
need to install those.

cmake/EthExecutableHelper.cmake

@@ -129,18 +129,21 @@ macro(eth_install_executable EXECUTABLE)
 
 		install(DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/Debug"
 			DESTINATION .
+			PATTERN "*.ilk" EXCLUDE
 			CONFIGURATIONS Debug
 			COMPONENT ${EXECUTABLE}
 		)
 
 		install(DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/Release"
 			DESTINATION .
+			PATTERN "*.ilk" EXCLUDE
 			CONFIGURATIONS Release
 			COMPONENT ${EXECUTABLE}
 		)
 
 		install(DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/RelWithDebInfo/"
 			DESTINATION bin
+			PATTERN "*.ilk" EXCLUDE
 			CONFIGURATIONS RelWithDebInfo
 			COMPONENT ${EXECUTABLE}
 		)