Log message:
libvterm03: Update to 0.3.3

Changes:
Unfortunately no changelog found upstream but neovim-0.10.0 will need it.

Log message:
import libvterm03 as devel/libvterm03 version 0.3

packaged by Thomas Merkel in wip

An abstract C99 library which implements a VT220 or xterm-like terminal
emulator. It doesn't use any particular graphics toolkit or output system,
instead it invokes callback function pointers that its embedding program
should provide it to draw on its behalf. It avoids calling malloc() during
normal running state, allowing it to be used in embedded kernel situations.