Remove unneeded -w0 option from base64 call

postinstall.cmake.in

 	message(STATUS "Generating secret key")
 	execute_process(
 		COMMAND ${DD} if=/dev/urandom bs=18 count=1
-		COMMAND ${BASE64} -w0
+		COMMAND ${BASE64}
 		OUTPUT_FILE "@CMAKE_CURRENT_BINARY_DIR@/${SECRET_FILE}"
 		ERROR_QUIET
 		OUTPUT_STRIP_TRAILING_WHITESPACE