tde_create_translated_desktop: Add the ability to call for the same source

file installed in another location.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 8d4479fbcc)

modules/TDEMacros.cmake

@@ -1916,6 +1916,8 @@ macro( tde_create_translated_desktop )
     file( RELATIVE_PATH _target "${CMAKE_SOURCE_DIR}" "${_target}" )
     string( REPLACE "/" "+" _target "${_target}-translated" )
 
+    if( NOT TARGET ${_target} )
+
       if( DESKTOP_MERGE_MSGFMT )
 
         # Decide which translations to build; the ones selected in the
@@ -1960,6 +1962,8 @@ macro( tde_create_translated_desktop )
       # merge translations target
       add_custom_target( "${_target}" ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${_basename} )
 
+    endif()
+
   else( )
 
     # just write the original file without translations