[gobject-introspection] MSVC builds: Remove a file that was added by mistake

[Chun-wei Fan <fanchunwei src gnome org>]

commit 37eedcd9daa1a9c54c0c992e32a1b6d018273c01
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Mar 17 15:30:07 2016 +0800

    MSVC builds: Remove a file that was added by mistake
    
    build/win32/vs10/gi-install.props is generated during 'make dist', so we
    don't want to add it into vresion control.
    
    Also drop a property sheet that is no longer used.

 build/win32/vs10/gi-extra-paths.props |   23 -----
 build/win32/vs10/gi-install.props     |  173 ---------------------------------
 2 files changed, 0 insertions(+), 196 deletions(-)