When ipsepcola is enabled, `gvpack` transitively links against lib/vpsc which is
partly written in C++. A consequence of this is that building `gvpack` requires
a C++ toolchain and linking against the C++ standard library. With this in mind,
there is no advantage for `gvpack` itself to be written in C instead of C++.
Moving to C++ will allow removing some manual memory management and data
structures.
This commit itself is just a straight rename. Upcoming changes will make the
code more idiomatic C++.
projects / graphviz / commit