Fix: ALIAS not globally visible targets with old cmake

Signed-off-by: hxbb00 <[email protected]>

Author: hxbb00

cmake/FindSpatiaLite.cmake

@@ -17,7 +17,12 @@ if(PkgConfig_FOUND)
 endif()
 
 if(PC_SPATIALITE_FOUND)
-  add_library(spatialite::spatialite ALIAS PkgConfig::PC_SPATIALITE)
+  set(SPATIALITE_INCLUDE_DIR "${PC_SPATIALITE_INCLUDE_DIRS}" CACHE STRING "")
+  set(SPATIALITE_LIBRARY "${PC_SPATIALITE_LIBRARIES}" CACHE STRING "")
+  if(NOT TARGET spatialite::spatialite)
+      add_library(spatialite::spatialite INTERFACE IMPORTED)
+      set_target_properties(spatialite::spatialite PROPERTIES INTERFACE_LINK_LIBRARIES PkgConfig::PC_SPATIALITE)
+  endif()
   set(SPATIALITE_FOUND TRUE)
 else()
   # Fallback for systems without PkgConfig, e.g. OSGeo4W