Added am_conditional for trilinos version.
Added am_conditional for trilinos version.

holke/libsc,cburstedde/libsc,johannrudi/libsc,johannrudi/libsc,johannrudi/libsc,holke/libsc,cburstedde/libsc,cburstedde/libsc,cburstedde/libsc,holke/libsc,holke/libsc,johannrudi/libsc,cburstedde/libsc,johannrudi/libsc