Fix hardcoded link flag to "dl" library

Fix "dlopen" function detection
(cherry picked from commit af2c2afb25)

CMakeLists.txt

@@ -463,10 +463,15 @@ set( kde_socklen_t socklen_t )
 
 ##### check for libdl ###########################
 
-find_library( HAVE_LIBDL dl )
-if( NOT HAVE_LIBDL-NOTFOUND )
 set( DL_LIBRARIES dl )
-endif( NOT HAVE_LIBDL-NOTFOUND )
+check_library_exists( ${DL_LIBRARIES} dlopen /lib HAVE_LIBDL )
+if( NOT HAVE_LIBDL )
+  unset( DL_LIBRARIES )
+  check_function_exists( dlopen HAVE_DLOPEN )
+  if( HAVE_DLOPEN )
+    set( HAVE_LIBDL 1 )
+  endif( HAVE_DLOPEN )
+endif( NOT HAVE_LIBDL )
 
 
 ##### check for utempter ########################

kstyles/kthemestyle/CMakeLists.txt

@@ -36,6 +36,6 @@ set( ${target}_SRCS
 
 tde_add_kpart( ${target} AUTOMOC
   SOURCES ${${target}_SRCS}
-  LINK kdefx-shared kdecore-shared dl
+  LINK kdefx-shared kdecore-shared ${DL_LIBRARIES}
   DESTINATION ${PLUGIN_INSTALL_DIR}/plugins/styles
 )