WIP: Remove stdc++fs

This was necessary for gcc prior to 9.1 and is no longer necessary.

CMakeLists.txt

@@ -201,7 +201,7 @@ else()
     add_library(caosdb
         SHARED ${libcaosdb_INCL} ${libcaosdb_SRC} ${GRPC_GENERATED})
      target_link_libraries(caosdb
-        grpc::grpc protobuf::protobuf boost::boost ${STDFSLIB}
+        grpc::grpc protobuf::protobuf boost::boost 
     )
      set(LIBCAOSDB caosdb)
 endif()
@@ -222,7 +222,7 @@ target_include_directories(caosdb PUBLIC
 add_library(ccaosdb SHARED src/ccaosdb.cpp ${GRPC_GENERATED})
 target_link_libraries(ccaosdb
     grpc::grpc protobuf::protobuf boost::boost
-    ${LIBCAOSDB} $(STDFSLIB)
+    ${LIBCAOSDB} 
 )
 target_include_directories(ccaosdb PUBLIC
     $<BUILD_INTERFACE:${libcaosdb_SOURCE_DIR}/include>