* pango/Makefile.am : add file.
* pango/Units.cs : new class to wrap PANGO_SCALE and PANGO_PIXELS.
* pango/glue/units.c : accessors for the macros.
* pango/glue/Makefile.am : build it.
* pango/glue/makefile.win32 : build it on win.
[Fixes#74837]
svn path=/trunk/gtk-sharp/; revision=44410