a few mips64el packages

Hi folks.

I have a not-too-weak laptop that is running the default mips64el setup,
that is: ABI=n32, soft float.

I've made some packages for my own use and uploaded the results to
nbftp.

They are available here:
https://cdn.netbsd.org/pub/pkgsrc/packages/NetBSD/mips64el/8.99_current/All/

Highlights:
gtk2, gtk3, python2.7, netsurf, vim-gtk, evince3

Random netbsd/mips statements:
- We can now run slightly less trivial n64 dynamic binaries in -current,
  but complex ones still fail.
- sudo crashed in rtld (I made PR 52914 for it), I am not sure what is
  wrong.
- I can't build emacs25, bootstrap-emacs is dying in gmalloc.c:1218

   │1218              if (next->next != NULL)
   │1219                next->next->prev = next;

It claims next->next->prev cannot be accessed, but I'm not sure what is
causing this.