tools.disassembler.udis: 1k ought to be enough for anybody.

(Work around change in struct sizes from 1.7 to 1.7.1).
tools.disassembler.udis: no longer need these tests.
sequences.extras: fix map-concat row-polymorphic problem.
sequences.extra: >resizable can't be inline for some reason...
factor.sh: Change deps-linux to deps-apt-get. Add deps-pacman
gtk: add library references.
opengl.gl: Fix opengl loading for Windows.
io.encodings: Add a stream-tell method for decoder streams.
unix.utmpx: Support utmpx on linux and fix on macosx. Add a unit test.
unix.utmpx: Fix bootstrap on linux, add platform-specific structs.