Avoid overriding user linker flags (LDFLAGS) for modules and shared libs

Signed-off-by: Fabio Rossi <rossi.f@inwind.it>
(cherry picked from commit d8177b4058)

CMakeLists.txt

@@ -1166,8 +1166,8 @@ add_definitions(
 )
 
 set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${TQT_CXX_FLAGS}" )
-set( CMAKE_SHARED_LINKER_FLAGS "-Wl,--no-undefined" )
-set( CMAKE_MODULE_LINKER_FLAGS "-Wl,--no-undefined" )
+set( CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--no-undefined" )
+set( CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,--no-undefined" )
 
 
 ##### headers ###################################

libtdescreensaver/CMakeLists.txt

@@ -17,7 +17,7 @@ include_directories(
   ${CMAKE_SOURCE_DIR}/tdecore
 )
 
-list( REMOVE_ITEM CMAKE_SHARED_LINKER_FLAGS "-Wl,--no-undefined" )
+string( REPLACE "-Wl,--no-undefined" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}" )
 
 link_directories(
   ${TDECORE_LIBRARY_DIRS}