build/win32/vs10/pango.propsin: Fix .lib installation
build/win32/vs10/pango.propsin: Fix .lib installation

Missed out the $(Platform) part when building the FontConfig flavor, so
make it up.

danny-ku/pango,Distrotech/pango,Distrotech/pango,Distrotech/pango,danny-ku/pango,danny-ku/pango