Fix compilation issues with vrtsim taps client

Fix two issues regarding vrtsims taps client implementation:
 - Incorrect #define used to enable taps socket handling
 - flatbuffers package name changing between ubuntu versions

radio/vrtsim/CMakeLists.txt

@@ -26,6 +26,14 @@ if (OAI_VRTSIM_TAPS_CLIENT)
 
   add_library(taps_client taps_client.cpp ${TAPS_API_HEADER})
   target_include_directories(taps_client PUBLIC .)
-  find_package(Flatbuffers REQUIRED)
+  find_package(FlatBuffers QUIET)
+  if(NOT FlatBuffers_FOUND)
+    # Fall back to lowercase (Ubuntu 22.04)
+    find_package(Flatbuffers REQUIRED)
+    set(FLATBUFFERS_TARGET flatbuffers)
+  else()
+    set(FLATBUFFERS_TARGET flatbuffers::flatbuffers)
+  endif()
+  target_link_libraries(taps_client PUBLIC ${FLATBUFFERS_TARGET})
   target_link_libraries(taps_client PUBLIC flatbuffers taps_api SIMU nanomsg)
 endif()

radio/vrtsim/vrtsim.c

@@ -189,13 +189,13 @@ static void vrtsim_readconfig(vrtsim_state_t *vrtsim_state)
   } else {
     AssertFatal(false, "Invalid role configuration\n");
   }
-#ifdef ENABLE_TAPS_CLIENT
+#ifdef OAI_VRTSIM_TAPS_CLIENT
   if (vrtsim_state->taps_socket) {
     LOG_A(HW, "VRTSIM: will use taps socket %s\n", vrtsim_state->taps_socket);
   }
 #else
   if (vrtsim_state->taps_socket) {
-    AssertFatal(false, "Invalid configuration: Build with ENABLE_TAPS_CLIENT to use taps socket\n");
+    AssertFatal(false, "Invalid configuration: Build with OAI_VRTSIM_TAPS_CLIENT to use taps socket\n");
   }
 #endif
 }