[atk] Remove win32/vs15/atk-install.props before re-generation

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

commit 55e457cc25395612a032417fed003c97eef165cc
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Feb 15 14:01:26 2017 +0800

    Remove win32/vs15/atk-install.props before re-generation
    
    This will ensure that it will be up-to-date when win32/vs10/atk-install.props
    is re-generated.

 win32/vs10/Makefile.am |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/win32/vs10/Makefile.am b/win32/vs10/Makefile.am
index 6f7acee..3c0c9be 100644
--- a/win32/vs10/Makefile.am
+++ b/win32/vs10/Makefile.am
@@ -20,6 +20,7 @@ atk-install.props: $(top_srcdir)/win32/vs10/atk-install.propsin atk.vs10.headers
        -$(RM) $(top_builddir)/win32/vs11/atk-install.props
        -$(RM) $(top_builddir)/win32/vs12/atk-install.props
        -$(RM) $(top_builddir)/win32/vs14/atk-install.props
+       -$(RM) $(top_builddir)/win32/vs15/atk-install.props
        $(CPP) -P - <$(top_srcdir)/win32/vs10/atk-install.propsin >$@
        rm atk.vs10.headers