[babl] babl-cache: fix previous cache file persisting on Win32

[Øyvind Kolås <ok src gnome org>]

commit 8b863c24c3f170265dbca16c7b895ac2cb63be62
Author: Edward E <develinthedetail gmail com>
Date:   Fri Apr 7 01:47:45 2017 -0500

    babl-cache: fix previous cache file persisting on Win32
    
    Cygwin's rename() won't overwrite an existing file, so remove() it first

 babl/babl-cache.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/babl/babl-cache.c b/babl/babl-cache.c
index f498115..abd6f0a 100644
--- a/babl/babl-cache.c
+++ b/babl/babl-cache.c
@@ -188,6 +188,9 @@ void babl_store_db (void)
   }
   fclose (dbfile);
 
+#ifdef _WIN32
+  remove (fish_cache_path ());
+#endif
   rename (tmpp, fish_cache_path());
   free (tmpp);
 }