Fix accidental cruft causing FTBFS

diff --git a/krfb/ConfigureChecks.cmake b/krfb/ConfigureChecks.cmake
index b488b03..2de58a4 100644
--- a/krfb/ConfigureChecks.cmake
+++ b/krfb/ConfigureChecks.cmake
@@ -16,8 +16,3 @@
 if( NOT XTST_FOUND )
   tde_message_fatal( "xtst is required, but was not found on your system" )
 endif( )
-
-pkg_search_module( LIBVNCSERVER libvncserver )
-if( NOT LIBVNCSERVER_FOUND )
-  tde_message_fatal( "libvncserver is required, but was not found on your system" )
-endif( )