gnu: gobject-introspection: Update absolute-shlib-path.patch.

gnu: gobject-introspection: Update absolute-shlib-path.patch.

Incorporate some changes from nixpkgs to the gobject-introspection package
patches.  This is motivated by looking at issues with libsoup and lollypop.
These changes mean that the share/gir-1.0/Soup-2.4.gir file within
libsoup (and the corresponding binary typelib) references libsoup-2.4.so.1
with an absolute filename, whereas previously, the filename wasn't absolute.

With an absolute filename in the typelib, loading libsoup from lollypop should
work.

* gnu/packages/patches/gobject-introspection-absolute-shlib-path.patch:
Incorporate changes from nixpkgs.