Get rid of std::filesystem linking

std::filesystem isn't needed since a6c5ff, where sysrepo schema fetching
was added. If I need it in the future, I can just readd it.

Change-Id: Iefc31f83e34e2240d6cb98436d98a780838678e7
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 99262a3..67fa45e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -133,11 +133,6 @@
 target_compile_definitions(sysrepo-cli PRIVATE SYSREPO_CLI)
 target_include_directories(sysrepo-cli PRIVATE ${REPLXX_PATH})
 target_link_libraries(sysrepo-cli sysrepoaccess yangschema docopt parser ${REPLXX_LIBRARY})
-if(CMAKE_CXX_FLAGS MATCHES "-stdlib=libc\\+\\+" AND CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
-    target_link_libraries(sysrepo-cli c++experimental)
-elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.1)
-    target_link_libraries(sysrepo-cli stdc++fs)
-endif()
 
 add_dependencies(sysrepo-cli target-NETCONF_CLI_VERSION)
 target_include_directories(sysrepo-cli PRIVATE ${PROJECT_BINARY_DIR})