No need to link gtk3_kde5 with generic vclplug

like this since initial commit but prolly just copy'n'pasta error

Change-Id: Id61c2d8ef1df496738575e4ee4879d71a40b4934
Reviewed-on: https://gerrit.libreoffice.org/71381
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/Library_vclplug_gtk3_kde5.mk

@@ -59,7 +59,6 @@ $(eval $(call gb_Library_add_libs,vclplug_gtk3_kde5,\
 
 $(eval $(call gb_Library_use_libraries,vclplug_gtk3_kde5,\
     svl \
-    vclplug_gen \
     vcl \
     tl \
     utl \