[babl] fish-cache: fix cache path on linux

[Øyvind Kolås <ok src gnome org>]

commit 02b2397fe72ccaa155b5ff8f240a18ea5679b477
Author: Victor Ananjevsky <ananasik gmail com>
Date:   Sun Mar 12 20:01:38 2017 +0100

    fish-cache: fix cache path on linux
    
    make babl on linux honor $XDG_CACHE_HOME variable, falling back to using
    $HOME/.cache

 babl/babl-cache.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/babl/babl-cache.c b/babl/babl-cache.c
index 5f7b716..f498115 100644
--- a/babl/babl-cache.c
+++ b/babl/babl-cache.c
@@ -78,7 +78,9 @@ static const char *fish_cache_path (void)
 
   strncpy (path, FALLBACK_CACHE_PATH, 4096);
 #ifndef _WIN32
-  if (getenv ("HOME"))
+  if (getenv ("XDG_CACHE_HOME"))
+    sprintf (path, "%s/babl/babl-fishes", getenv("XDG_CACHE_HOME"));
+  else if (getenv ("HOME"))
     sprintf (path, "%s/.cache/babl/babl-fishes", getenv("HOME"));
 #else
 {