[libsoup] Remove soup-install.props's on re-generation

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

commit 4ac48c8aea208993d9eab464f3fbb58420054508
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Oct 19 19:39:34 2016 +0800

    Remove soup-install.props's on re-generation
    
    This is to ensure that the changes in the generated build/win32/vs10/soup-install.props
    is applied to the soup-install.props's in build/win32/vs[11|12|14].

 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 345bee8..1d87d37 100644
--- a/build/win32/vs10/Makefile.am
+++ b/build/win32/vs10/Makefile.am
@@ -28,6 +28,9 @@ EXTRA_DIST = \
        $(GENERATED_ITEMS)
 
 soup-install.props: $(top_srcdir)/build/win32/vs10/soup-install.propsin $(MSVC_HEADERS_LIST)
+       -$(RM) $(top_builddir)/build/win32/vs11/soup-install.props
+       -$(RM) $(top_builddir)/build/win32/vs12/soup-install.props
+       -$(RM) $(top_builddir)/build/win32/vs14/soup-install.props
        $(CPP) -P - <$(top_srcdir)/build/win32/vs10/soup-install.propsin >$@
        rm $(MSVC_HEADERS_LIST)