[json-glib] build/Makefile.msvcproj: Remove MSVC 2017 projects before regenerating

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

commit f73c040415dcf5259f00ee87c94ef7b764d23291
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon Mar 13 15:08:42 2017 +0800

    build/Makefile.msvcproj: Remove MSVC 2017 projects before regenerating
    
    This ensures that the latest 2010 projects are copied and updated to generate
    the 2017 projects.

 build/Makefile.msvcproj |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/build/Makefile.msvcproj b/build/Makefile.msvcproj
index f127eea..166d1d2 100644
--- a/build/Makefile.msvcproj
+++ b/build/Makefile.msvcproj
@@ -70,6 +70,8 @@ $(top_builddir)/build/win32/vs9/$(1).vcproj: Makefile
        -$(RM) $(top_builddir)/build/win32/vs12/$(1).vcxproj.filters
        -$(RM) $(top_builddir)/build/win32/vs14/$(1).vcxproj
        -$(RM) $(top_builddir)/build/win32/vs14/$(1).vcxproj.filters
+       -$(RM) $(top_builddir)/build/win32/vs15/$(1).vcxproj
+       -$(RM) $(top_builddir)/build/win32/vs15/$(1).vcxproj.filters
 
 
        for F in $(_proj_files); do \