Bump trilinos to version 11.0.3

Notable changes:

  - Install libraries directly to $(get_libdir) instead of
    $(get_libdir)/trilinos: Trilinos libraries have a sufficient distinct
    name so a file collision is unlikely. More important, this fixes issues
    for third party projects expecting the libraries to reside in
    $(get_libdir).

  - Fix install locations for the CMake project config files.

  - Work around a bug where trilinos installs to /var/tmp/portage/...
Change to EAPI 5, rearrange SLOT, LICENSE, etc.
Merge pull request #59 from tamiko/bump-trilinos

Bump trilinos to version 11.0.3