[atk] build/win32/vs10/Makefile.am: Remove atk-install.props's on re-generation

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

commit 301c97d30db6f7f4bf4735da015ea8f6ab0c9c8d
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Oct 19 15:44:09 2016 +0800

    build/win32/vs10/Makefile.am: Remove atk-install.props's on re-generation
    
    This ensures that changes made to the generated atk-install.props are applied
    to build/win32/vs[11|12|14] as well.

 build/win32/vs10/Makefile.am |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/build/win32/vs10/Makefile.am b/build/win32/vs10/Makefile.am
index 8a3f7c4..64a1d24 100644
--- a/build/win32/vs10/Makefile.am
+++ b/build/win32/vs10/Makefile.am
@@ -17,6 +17,9 @@ EXTRA_DIST =  \
        $(GENERATED_ITEMS)
 
 atk-install.props: $(top_srcdir)/build/win32/vs10/atk-install.propsin atk.vs10.headers
+       -$(RM) $(top_builddir)/build/win32/vs11/atk-install.props
+       -$(RM) $(top_builddir)/build/win32/vs12/atk-install.props
+       -$(RM) $(top_builddir)/build/win32/vs14/atk-install.props
        $(CPP) -P - <$(top_srcdir)/build/win32/vs10/atk-install.propsin >$@
        rm atk.vs10.headers