Message says "compilation succeeded" despite make failing

[bcc32]

I'm seeing M-x vterm-module-compile succeed even when the build actually fails, messaging:

Compilation of `emacs-libvterm' module succeeded

I think this code:

https://github.com/akermu/emacs-libvterm/blob/056ad74653704bc353d8ec8ab52ac75267b7d373/vterm.el#L119-L126

just needs to use set -e or switch to && rather than ;.