[glib] build/Makefile.msvcproj: Fix cleanup

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

commit c5754bdc43f64c04ac0bd36f28c36d378caca1fa
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Tue Dec 20 14:36:02 2016 +0800

    build/Makefile.msvcproj: Fix cleanup
    
    When we make Visual Studio 2013 the baseline Visual Studio version, we need to
    the *.vs12.sourcefiles that are generated along the way so that 'make distcheck'
    won't complain about the leftover files.  This was not caught in GLib as we do
    not yet require Visual Studio 2013, but we update this here as this module is
    intended to be used in projects that support Visual Studio project builds.

 build/Makefile.msvcproj |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/build/Makefile.msvcproj b/build/Makefile.msvcproj
index 2a2dd89..a7bae54 100644
--- a/build/Makefile.msvcproj
+++ b/build/Makefile.msvcproj
@@ -128,6 +128,8 @@ $(top_builddir)/build/win32/vs12/$(1).vcxproj: Makefile
 
        $(CPP) -P - <$(top_srcdir)/build/win32/vs12/$(1).vcxprojin 
> $(top_builddir)/build/win32/vs12/$(1).vcxproj
        $(CPP) -P - <$(top_srcdir)/build/win32/vs12/$(1).vcxproj.filtersin 
> $(top_builddir)/build/win32/vs12/$(1).vcxproj.filters
+       $(RM) $(1).vs12.sourcefiles
+       $(RM) $(1).vs12.sourcefiles.filters
 
 $(top_builddir)/build/win32/vs12/$(1).vs12.headers: Makefile
        -$(RM) $(top_builddir)/build/win32/vs12/$(1).vs12.headers