Following the meson porting guidelines, this patch renames the build
options. The list of changes is as follows:

- Remove the with prefix from string options.
- The character separator from multi-word options has been changed
  to underscore.

It also changes the introspection and static meson variables to be
consistent with the one used for alsa.

https://bugzilla.gnome.org/show_bug.cgi?id=792948