sci-libs/trilinos: Bugfixes:

Add forgotten manifest statement for trilinos-11.4.2

Also provide a env.d/99trilinos file that registers $(get_libdir)/trilinos
into LDPATH so that the library locations are actually known by the dynamic
linker.
Merge pull request #139 from tamiko/fix_trilinos_ldpath

sci-libs/trilinos: Bugfixes: