gobject-introspection: Don't write $HOME into scripts

Writing an expanded version of $HOME into the wrapper script breaks
reproducibility. We don't need this here so don't.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 5df09252)
Signed-off-by: Steve Sakoman <steve@sakoman.com>