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

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

commit af53ff59328aa175920e23c5c1b1fbcca0059921
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Feb 15 14:04:05 2017 +0800

    Remove win32/vs15/pango-install.props before re-generation
    
    This will ensure that it will be up-to-date when
    win32/vs10/pango-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 e8cbc36..30ebcff 100644
--- a/win32/vs10/Makefile.am
+++ b/win32/vs10/Makefile.am
@@ -34,6 +34,7 @@ pango-install.props: $(top_srcdir)/win32/vs10/pango-install.propsin pango.vs10.h
        -$(RM) $(top_builddir)/win32/vs11/pango-install.props
        -$(RM) $(top_builddir)/win32/vs12/pango-install.props
        -$(RM) $(top_builddir)/win32/vs14/pango-install.props
+       -$(RM) $(top_builddir)/win32/vs15/pango-install.props
        $(CPP) -P - <$(top_srcdir)/win32/vs10/pango-install.propsin >$@
        rm pango.vs10.headers