Fix BUILD_RTI=OFF build: Guard RTI-only DDS modules

- LtsUtilsSettings: Fix export header include path (angle brackets)
- LtsWidgets: Move LtsUtilsSettings to PUBLIC link libraries
- BatteryNotification: Remove unused QDesktopWidget include
- DDS/FTC: Wrap ddsftccore library in IF(BUILD_RTI) guards
- DDS/FTS: Remove ELSE block, wrap entire library in IF(BUILD_RTI)
- DDS/DTC: Wrap entire library definition in IF(BUILD_RTI)
- DDS/DTS: Wrap entire library definition in IF(BUILD_RTI)
- DDS/DDSConnector: Wrap entire library in IF(BUILD_RTI), remove ELSE
- DDS/Routing: Wrap entire library in IF(BUILD_RTI)

All RTI Connext DDS-specific libraries (ddscore, ddsQoS, ddsgen,
ddsdtc, ddsdts, ddsfts, ddsconnector, routing_plugin) are now
properly guarded so BUILD_RTI=OFF builds can succeed.

qt6-after/qt6-migrated-legatus/Lts/DDS/DDSConnector/CMakeLists.txt

@@ -4,6 +4,8 @@
 # $Author$
 #
 
+IF(BUILD_RTI)
+
 SET(SRCS
   dds_connector.cpp
   dds_connector.h
@@ -21,29 +23,18 @@ NGL_TARGET_INCLUDE_DIRECTORIES(
   INTERFACE
     ${CMAKE_CURRENT_SOURCE_DIR}/../../
 )
-IF(BUILD_RTI)
-  NGL_TARGET_LINK_LIBRARIES(ddsconnector
-    PRIVATE
-      NGLLogger
-    PUBLIC
-      RTI::nddsc
-      RTI::nddscore
-      RTI::nddscpp2
-      ddsQoS
-      ddsdtc
-      ddsdts
-      ProjectConfig
-      Qt6::Core
-  )
-ELSE()
-  NGL_TARGET_LINK_LIBRARIES(ddsconnector
-    PRIVATE
-      NGLLogger
-    PUBLIC
-      ddsQoS
-      ddsdtc
-      ddsdts
-      ProjectConfig
-      Qt6::Core
-  )
-ENDIF()
+NGL_TARGET_LINK_LIBRARIES(ddsconnector
+  PRIVATE
+    NGLLogger
+  PUBLIC
+    RTI::nddsc
+    RTI::nddscore
+    RTI::nddscpp2
+    ddsQoS
+    ddsdtc
+    ddsdts
+    ProjectConfig
+    Qt6::Core
+)
+
+ENDIF(BUILD_RTI)