Don't use the 'interface' name, it conflicts with definitions in W32 headers

git-svn-id: https://gnunet.org/svn/gnunet@34096 140774ce-b5e7-0310-ab8b-a85725594a96
There's no GNUNET_LDFLAGS, there's only GN_LIB_FLAGS

This fixes a number of build errors on W32, where -no-undefined is needed
to link shared libraries, and -no-undefined comes via GN_LIB_FLAGS.

git-svn-id: https://gnunet.org/svn/gnunet@34097 140774ce-b5e7-0310-ab8b-a85725594a96
x-vine:fixes


git-svn-id: https://gnunet.org/svn/gnunet@34098 140774ce-b5e7-0310-ab8b-a85725594a96